List of volcanic features on Io

Culann Patera (greenish features above center) with associated lava flows and red volcanic plume deposits. Portions of Tohil Patera to the lower right.

This is a list of named volcanic surface features on Jupiter's moon Io. These names have been approved for use by the International Astronomical Union. The features listed below represent a subset of the total known volcanic features on Io's surface with the majority currently not having an officially approved name.

The names of volcanic features on Io use a combination of a name derived from mythological figures from around the world related to the Sun, fire, volcanoes, thunder, or smithing, places from the Greek mythological story of Io, Dante's Inferno, or from the name of a nearby feature on Io's surface and an approved descriptive term. The descriptive term used is based on the type of feature named and how it was first discovered. Volcanoes that were first observed as an active feature from observations of a volcanic plume fit under the category of "Eruptive Center" and do not use a descriptive term, though portions of these features may have also received names that do use a descriptive term, like Prometheus Patera or Masubi Fluctus. Lava flows use the descriptive term fluctus or the plural fluctūs, e.g. . Volcanic depressions use the term patera or the plural paterae, e.g. Ah Peku Patera. The term has also become the generic term for referring to these structures. Small shield volcanoes use the term tholus or the plural tholi, e.g. . Finally, channels carved by volcanic lava flows through thermal erosion use the term vallis or the plural valles.

See also the list of mountains on Io and the list of regions on Io.

Eruptive centers[]

The Eruptive Center Prometheus

Eruptive centers on Io are locations typically where major volcanic activity was observed and characterized before the volcanic landform was. Coordinate, diameter, and name source come from the IAU's Solar System Nomenclature Website.^[1] All of these features have been observed as active volcanoes on Io.

Volcano	Named after	Coordinates
Amirani	Amirani (Georgian)	24°28′N 114°41′W / 24.46°N 114.68°W / 24.46; -114.68 (Amirani)
	Kāne Milohai (Hawaiian)	18°13′S 33°37′W / 18.21°S 33.61°W / -18.21; -33.61 (Amirani)
Loki	Loki (Norse)	18°13′N 302°34′W / 18.22°N 302.56°W / 18.22; -302.56 (Loki)
	Marduk (Babylonian)	29°17′S 209°44′W / 29.29°S 209.74°W / -29.29; -209.74 (Marduk)
Masubi	Ho-Masubi (Japanese)	49°36′S 56°11′W / 49.6°S 56.18°W / -49.6; -56.18 (Masubi)
	Māui (Hawaiian)	19°32′N 122°19′W / 19.53°N 122.31°W / 19.53; -122.31 (Maui)
Pele	Pele (Hawaiian)	18°43′S 255°17′W / 18.71°S 255.28°W / -18.71; -255.28 (Pele)
Prometheus	Prometheus (Greek)	1°31′S 153°56′W / 1.52°S 153.94°W / -1.52; -153.94 (Prometheus)
Surt	Surtr (Icelandic)	45°13′N 336°29′W / 45.21°N 336.49°W / 45.21; -336.49 (Surt)
Thor	Thor (Norse)	39°09′N 133°08′W / 39.15°N 133.14°W / 39.15; -133.14 (Thor)
	Völundr (Norse)	28°37′N 172°30′W / 28.62°N 172.5°W / 28.62; -172.5 (Volund)
Zamama	Zamama (Sumerian)	18°26′N 172°35′W / 18.43°N 172.59°W / 18.43; -172.59 (Zamama)

Paterae[]

The following table lists named volcanic depressions or paterae on Io. Coordinate, diameter, and name source come from the IAU's Solar System Nomenclature Website.^[1] Notes on whether the patera has been observed as an active volcano by either ground-based astronomers, the Hubble Space Telescope, or the various spacecraft that have encountered the Jupiter system come from the book, Volcanism on Io, unless otherwise noted.^[2]

In 2006, the use of the term catena /kəˈtiːnə/, for Ionian volcanoes with multiple depressions, was discontinued in favor of the plural paterae /ˈpætərə/. These features are Tvashtar Paterae, , and .

Patera	Named after	Coordinates	Diameter (km)	Activity Observed
	Ababinili (Chickasaw)	12°47′N 142°10′W / 12.79°N 142.16°W / 12.79; -142.16 (Ababinili Patera)	105.0	No
	Agni (Hindu and others)	40°48′S 333°03′W / 40.8°S 333.05°W / -40.8; -333.05 (Agni Patera)	19.7	No
Ah Peku Patera	Ah Peku (Mayan)	10°20′N 107°02′W / 10.34°N 107.04°W / 10.34; -107.04 (Ah Peku Patera)	84.0	Yes
	(Irish)	34°24′S 177°05′W / 34.4°S 177.09°W / -34.4; -177.09 (Aidne Patera)	30.26	Yes
	Altjira (Australian Aboriginal)	1°47′S 108°58′W / 1.78°S 108.97°W / -1.78; -108.97 (Altjirra Patera)	52.55	Yes
Amaterasu Patera	Amaterasu (Japanese)	38°08′N 306°32′W / 38.13°N 306.53°W / 38.13; -306.53 (Amaterasu Patera)	93.1	Yes
	(Dakota)	21°09′S 8°47′W / 21.15°S 8.79°W / -21.15; -8.79 (Angpetu Patera)	13.68	No
	Aramazd (Armenian)	73°35′S 336°49′W / 73.58°S 336.81°W / -73.58; -336.81 (Aramazd Patera)	68.82	No
	Arusha (Hindu)	39°04′S 101°29′W / 39.06°S 101.48°W / -39.06; -101.48 (Arusha Patera)	68.07	Yes
Asha Patera	Asha (Zoroastrian)	8°50′S 225°41′W / 8.84°S 225.69°W / -8.84; -225.69 (Asha Patera)	108.33	Yes
	Atar (Zoroastrian)	31°06′N 278°35′W / 31.1°N 278.58°W / 31.1; -278.58 (Ātar Patera)	86.41	Yes
	Aten (Egyptian)	48°32′S 310°01′W / 48.53°S 310.02°W / -48.53; -310.02 (Aten Patera)	43.4	Yes
Babbar Patera	Babbar (Sumerian)[1]	39°47′S 271°59′W / 39.79°S 271.98°W / -39.79; -271.98 (Babbar Patera)	85.74	Yes
	Balder (Norse)	11°26′N 156°06′W / 11.44°N 156.1°W / 11.44; -156.1 (Balder Patera)	42.0	No
	Belenus (Celtic)	2°54′N 157°43′W / 2.9°N 157.72°W / 2.9; -157.72 (Belenus Patera)	23.01	No
	Bochica (Muisca)	61°30′S 18°51′W / 61.5°S 18.85°W / -61.5; -18.85 (Bochica Patera)	52.38	No
	Camaxtli (Aztec)	15°15′N 136°48′W / 15.25°N 136.8°W / 15.25; -136.8 (Camaxtli Patera)	58.39	Yes
	Carancho ()	1°26′N 317°12′W / 1.43°N 317.2°W / 1.43; -317.2 (Carancho Patera)	30.04	No
	Catequil (Inca)	23°53′S 16°34′W / 23.89°S 16.57°W / -23.89; -16.57 (Cataquil Patera)	133.95	No
	Cautha (Etruscan)	53°46′S 101°35′W / 53.76°S 101.58°W / -53.76; -101.58 (Catha Patera)	68.59	Yes
	Chaac (Mayan)	11°53′N 157°26′W / 11.88°N 157.44°W / 11.88; -157.44 (Chaac Patera)	95.88	Yes
	Chors (Slavic)	68°28′N 249°51′W / 68.47°N 249.85°W / 68.47; -249.85 (Chors Patera)	64.97	Yes
	Creidhne (Celtic)	53°01′S 342°32′W / 53.02°S 342.53°W / -53.02; -342.53 (Creidne Patera)	152.82	Yes
	Cuchi (Australian Aboriginal)	0°54′S 144°34′W / 0.9°S 144.57°W / -0.9; -144.57 (Cuchi Patera)	76.28	Yes
	Culann (Celtic)	20°13′S 160°10′W / 20.22°S 160.17°W / -20.22; -160.17 (Culann Patera)	54.48	Yes
	Daedalus (Greek)	19°31′N 274°21′W / 19.52°N 274.35°W / 19.52; -274.35 (Daedalus Patera)	73.29	Yes
Dazhbog Patera	Dazhbog (Slavic)	55°06′N 301°29′W / 55.1°N 301.48°W / 55.1; -301.48 (Dazhbog Patera)	118.39	Yes
	Dingir (Sumerian)	4°08′S 341°22′W / 4.13°S 341.37°W / -4.13; -341.37 (Dingir Patera)	47.38	No
	(Nabataean)	37°28′N 119°01′W / 37.47°N 119.02°W / 37.47; -119.02 (Dusura Patera)	68.58	Yes
	Ekhi (Basque)	28°21′S 88°30′W / 28.35°S 88.5°W / -28.35; -88.5 (Ekhi Patera)	51.04	Yes
	( people of New Britain)	3°20′S 119°49′W / 3.33°S 119.82°W / -3.33; -119.82 (Emakong Patera)	80.08	Yes
Estan Patera	Estan (Hittite)	21°37′N 87°43′W / 21.61°N 87.71°W / 21.61; -87.71 (Estan Patera)	95.0	Yes
	(Chinese)	40°47′N 192°15′W / 40.79°N 192.25°W / 40.79; -192.25 (Fo Patera)	47.15	Yes
Fuchi Patera	Kamuy Fuchi (Ainu)	28°20′N 327°34′W / 28.34°N 327.57°W / 28.34; -327.57 (Fuchi Patera)	63.67	Yes
	Gabija (Lithuanian)	51°54′S 202°32′W / 51.9°S 202.53°W / -51.9; -202.53 (Gabija Patera)	48.0	Yes
	(Mongol)	10°52′S 288°07′W / 10.87°S 288.11°W / -10.87; -288.11 (Galai Patera)	105.23	No
	Gibil (Sumerian)	14°59′S 294°38′W / 14.99°S 294.64°W / -14.99; -294.64 (Gibil Patera)	102.38	Yes?
	Girru (Babylonian)	22°48′N 239°55′W / 22.8°N 239.92°W / 22.8; -239.92 (Girru Patera)	68.23	Yes
Gish Bar Patera	(Babylonian)	16°11′N 90°16′W / 16.18°N 90.26°W / 16.18; -90.26 (Gish Bar Patera)	122.25	Yes
	Grannus (Celtic)	11°10′N 145°17′W / 11.17°N 145.29°W / 11.17; -145.29 (Grannos Patera)	45.0	No
	Grian (Celtic)	11°50′S 11°59′W / 11.84°S 11.98°W / -11.84; -11.98 (Grian Patera)	70.0	Yes
	Haokah (Lakota)	20°52′S 186°39′W / 20.87°S 186.65°W / -20.87; -186.65 (Haokah Patera)	53.86	Yes
	()	59°25′S 31°59′W / 59.42°S 31.99°W / -59.42; -31.99 (Hatchawa Patera)	84.98	No
	(Bushman)	29°47′N 244°51′W / 29.79°N 244.85°W / 29.79; -244.85 (Heiseb Patera)	62.48	No
	Heno (Iroquois)	57°08′S 311°28′W / 57.14°S 311.47°W / -57.14; -311.47 (Heno Patera)	71.06	Yes
	Hephaestus (Greek)	1°57′N 289°47′W / 1.95°N 289.79°W / 1.95; -289.79 (Hephaestus Patera)	38.84	Yes
	Hi'iaka (Hawaiian)	3°38′S 79°28′W / 3.64°S 79.47°W / -3.64; -79.47 (Hi'iaka Patera)	128.27	Yes
	Hiruko (Japanese)	65°05′S 328°50′W / 65.09°S 328.83°W / -65.09; -328.83 (Hiruko Patera)	89.54	No
	Horus (Egyptian)	9°49′S 338°00′W / 9.82°S 338.0°W / -9.82; -338.0 (Horus Patera)	144.21	No
	(Chinese)	15°01′S 328°59′W / 15.01°S 328.98°W / -15.01; -328.98 (Huo Shen Patera)	62.73	No
	Ilmarinen (Finnish)	14°26′S 1°09′W / 14.44°S 1.15°W / -14.44; -1.15 (Ilmarinen Patera)	45.94	No
	Inti (Inca)	68°22′S 347°31′W / 68.37°S 347.52°W / -68.37; -347.52 (Inti Patera)	70.91	No
	Isum (Assyrian)	29°49′N 208°28′W / 29.82°N 208.46°W / 29.82; -208.46 (Isum Patera)	62.24	Yes
	Itzamna (Mayan)	16°08′S 99°28′W / 16.13°S 99.46°W / -16.13; -99.46 (Itzamna Patera)	126.36	Yes
	Janus (Roman)	4°34′S 39°03′W / 4.56°S 39.05°W / -4.56; -39.05 (Janus Patera)	60.07	Yes
Kami-Nari Patera	Kami-Nari (Japanese)	8°42′S 235°05′W / 8.7°S 235.08°W / -8.7; -235.08 (Kami-Nari Patera)	53.39	No
	Kāne (Hawaiian)	48°23′S 11°46′W / 48.39°S 11.77°W / -48.39; -11.77 (Kane Patera)	135.77	No
	(Semang people of the Malay Peninsula)	0°12′N 13°05′W / 0.2°N 13.08°W / 0.2; -13.08 (Karei Patera)	35.29	Yes
	Kava (mythology) (Persian)	16°50′S 341°20′W / 16.83°S 341.33°W / -16.83; -341.33 (Kava Patera)	63.82	No
	(Bushman)	5°08′N 303°34′W / 5.14°N 303.56°W / 5.14; -303.56 (Khalla Patera)	48.24	No
	()	11°50′S 305°06′W / 11.83°S 305.1°W / -11.83; -305.1 (Kibero Patera)	63.34	No
Kinich Ahau Patera	Kinich Ahau (Mayan)	49°20′N 310°12′W / 49.34°N 310.2°W / 49.34; -310.2 (Kinich Ahau Patera)	45.21	Yes
	Kurdalagon (Ossetian)	49°37′S 217°59′W / 49.61°S 217.99°W / -49.61; -217.99 (Kurdalagon Patera)	28.15	Yes
	(Kayan people of Borneo)	38°56′S 61°56′W / 38.94°S 61.93°W / -38.94; -61.93 (Laki-oi Patera)	105.16	No
	Llew (Celtic)	12°10′N 242°19′W / 12.16°N 242.31°W / 12.16; -242.31��� (Llew Patera)	78.0	Yes
Loki Patera	Loki (Norse)	12°58′N 308°48′W��� / 12.97°N 308.8°W / 12.97; -308.8 (Loki Patera)	227.79	Yes
	(Chinese)	38°31′S 353°10′W / 38.52°S 353.17°W / -38.52; -353.17 (Lu Huo Patera)	63.95	No
	(Hopi)	40°17′S 339°05′W / 40.28°S 339.09°W / -40.28; -339.09 (Maasaw Patera)	43.99	No
	Mahu-ike (Polynesian)	13°31′S 259°28′W / 13.52°S 259.47°W / -13.52; -259.47 (Mafuike Patera)	148.32	No
	(Babylonian and Canaanite)	34°09′S 129°35′W / 34.15°S 129.59°W / -34.15; -129.59 (Malik Patera)	121.68	Yes
	Mama (Chibchan people of Central America)	11°17′S 355°19′W / 11.28°S 355.31°W / -11.28; -355.31 (Mama Patera)	15.72	No
Manua Patera	(Hawaiian)	35°47′N 321°44′W / 35.78°N 321.73°W / 35.78; -321.73 (Manua Patera)	110.51	Yes
	Masaya (Nicaraguan)	22°37′S 344°29′W / 22.62°S 344.49°W / -22.62; -344.49 (Masaya Patera)	55.09	No
Maui Patera	Māui (Hawaiian)	16°37′N 124°15′W / 16.61°N 124.25°W / 16.61; -124.25 (Maui Patera)	37.84	Yes
	Ahura Mazda (Zoroastrian)	8°49′S 313°17′W / 8.81°S 313.28°W / -8.81; -313.28 (Mazda Paterae)	240.78	Yes
	(Pygmy)	31°30′S 5°04′W / 31.5°S 5.06°W / -31.5; -5.06 (Mbali Patera)	40.7	Yes
	(Mandan) people of North America)	31°19′S 344°45′W / 31.31°S 344.75°W / -31.31; -344.75 (Menahka Patera)	9.15	No
	Mentu (Egyptian)	7°00′N 139°22′W / 7.0°N 139.36°W / 7.0; -139.36 (Mentu Patera)	103.0	No
	Michabo (Algonquian peoples of North America)	1°12′N 167°36′W / 1.2°N 167.6°W / 1.2; -167.6 (Michabo Patera)	104.0	Yes
	Mihr (Armenian)	16°31′S 305°27′W / 16.51°S 305.45°W / -16.51; -305.45 (Mihr Patera)	61.72	Yes
Mithra Patera	Mithra (Zoroastrian)	59°00′S 266°28′W / 59.0°S 266.46°W / -59.0; -266.46 (Mithra Patera)	33.78	Yes
Monan Patera	a god of the Tupí-Guaraní (Brazil)[3]	19°43′N 105°23′W / 19.72°N 105.39°W / 19.72; -105.39 (Monan Patera)	112.89	Yes
	Mulungu (East African)	17°16′N 217°52′W / 17.26°N 217.87°W / 17.26; -217.87 (Mulungu Patera)	62.48	Yes
	Namarrkun (Australian Aboriginal)	10°04′N 175°31′W / 10.06°N 175.52°W / 10.06; -175.52 (Namarrkun Patera)	16.69	No
	Nina (Inca)	38°14′S 162°36′W / 38.24°S 162.6°W / -38.24; -162.6 (Nina Patera)	52.07	No
	Ninurta (Sumerian and Akkadian)	16°44′S 315°15′W / 16.74°S 315.25°W / -16.74; -315.25 (Nunurta Patera)	82.34	No
	Nusku (Assyrian)	65°01′S 3°49′W / 65.01°S 3.82°W / -65.01; -3.82 (Nusku Patera)	124.31	Yes
	Nyambe (Zambezi)	0°23′N 343°07′W / 0.38°N 343.11°W / 0.38; -343.11 (Nyambe Patera)	58.15	No
	Ot Ene (Mongol)	1°06′N 217°24′W / 1.1°N 217.4°W / 1.1; -217.4 (Ot Patera)	52.26	Yes
	(Sami)	45°43′S 358°32′W / 45.71°S 358.54°W / -45.71; -358.54 (Päive Patera)	59.05	No
	(Hopi)	34°12′S 345°35′W / 34.2°S 345.59°W / -34.2; -345.59 (Pautiwa Patera)	6.62	No
Pillan Patera	Pillan (Mapuche people of South America)	12°20′S 243°15′W / 12.34°S 243.25°W / -12.34; -243.25 (Pillan Patera)	73.43	Yes
	(Evenk people of Russia and China)	18°25′S 304°44′W / 18.41°S 304.74°W / -18.41; -304.74 (Podja Patera)	67.03	No
Prometheus Patera	Prometheus (Greek)	0°37′S 152°27′W / 0.62°S 152.45°W / -0.62; -152.45 (Prometheus Patera)	73.43	Yes
	(Mordvin people of Russia)	2°37′S 297°18′W / 2.61°S 297.3°W / -2.61; -297.3 (Purgine Patera)	35.74	No
Pyerun Patera	Perun (Slavic)	55°38′S 251°13′W / 55.64°S 251.21°W / -55.64; -251.21 (Pyerun Patera)	52.18	Yes
Ra Patera	Ra (Egyptian)	8°40′S 324°42′W / 8.66°S 324.7°W / -8.66; -324.7 (Ra Patera)	39.11	Yes
	Radagast (Slavic)	27°47′S 159°59′W / 27.78°S 159.98°W / -27.78; -159.98 (Radegast Patera)	27.11	Yes
	Rarog (Slavic)	41°43′S 304°25′W / 41.71°S 304.41°W / -41.71; -304.41 (Rarog Patera)	104.35	Yes
	Rātā (Māori)	35°37′S 199°47′W / 35.61°S 199.78°W / -35.61; -199.78 (Rata Patera)	46.31	Yes
Reiden Patera	Reiden (Japanese)	13°24′S 235°27′W / 13.4°S 235.45°W / -13.4; -235.45 (Reiden Patera)	73.26	Yes
	Reshef (Phoenician)	27°41′N 158°04′W / 27.69°N 158.06°W / 27.69; -158.06 (Reshef Patera)	62.0	No
	Reshet (Aramaic)	0°32′S 305°29′W / 0.53°S 305.48°W / -0.53; -305.48 (Reshet Paterae)	148.34	No
	Ruaumoko (Māori)	14°43′N 139°44′W / 14.72°N 139.74°W / 14.72; -139.74 (Ruaumoko Patera)	19.0	Yes
	Ruwa (East African)	0°11′N 1°45′W / 0.19°N 1.75°W / 0.19; -1.75 (Ruwa Patera)	62.44	Yes
	Savitr (Hindu)	48°11′N 123°22′W / 48.19°N 123.36°W / 48.19; -123.36 (Savitr Patera)	92.48	No
	(Phoenician)	2°55′S 303°34′W / 2.91°S 303.57°W / -2.91; -303.57 (Sêd Patera)	52.1	No
	Sengen (Japanese)	32°53′S 303°44′W / 32.89°S 303.73°W / -32.89; -303.73 (Sengen Patera)	63.64	Yes
	Seth (Egyptian)	5°21′S 131°40′W / 5.35°S 131.67°W / -5.35; -131.67 (Seth Patera)	59.82	Yes
	Sethlans (Etruscan)	52°17′S 193°50′W / 52.29°S 193.83°W / -52.29; -193.83 (Sethlaus Patera)	78.57	Yes
	Shakuru (Pawnee people of North America)	24°07′S 265°44′W / 24.12°S 265.74°W / -24.12; -265.74 (Shakuru Patera)	105.01	Yes
	Shamash (Babylonian and Assyrian)	34°59′S 152°35′W / 34.99°S 152.59°W / -34.99; -152.59 (Shamash Patera)	205.3	Yes
	(Arabian)	10°04′S 62°58′W / 10.07°S 62.97°W / -10.07; -62.97 (Shamshu Patera)	96.36	Yes
Shango Patera	Shango (Yorùbá)	32°21′N 100°31′W / 32.35°N 100.52°W / 32.35; -100.52 (Shango Patera)	90.22	Yes[4]
	Shoshu (Caucasian)	20°22′S 324°40′W / 20.36°S 324.67°W / -20.36; -324.67 (Shoshu Patera)	13.08	No
	Sigurd (Norse)	5°56′S 97°56′W / 5.94°S 97.93°W / -5.94; -97.93 (Sigurd Patera)	68.6	Yes
	(Nanai people of Siberia)	49°50′S 0°26′W / 49.84°S 0.44°W / -49.84; -0.44 (Siun Patera)	52.5	No
	Steropes (Greek)	15°32′N 138°51′W / 15.54°N 138.85°W / 15.54; -138.85 (Siun Patera)	20.0	No
	(Chinese)	19°06′S 2°39′W / 19.1°S 2.65°W / -19.1; -2.65 (Sui Jen Patera)	33.78	No
	Surya (Hindu)	21°28′S 151°35′W / 21.47°S 151.59°W / -21.47; -151.59 (Surya Patera)	49.81	Yes
	Susanoo (Japanese)	22°23′N 219°48′W / 22.39°N 219.8°W / 22.39; -219.8 (Susanoo Patera)	58.41	Yes
Svarog Patera	Svarog (Slavic)	48°40′S 265°44′W / 48.66°S 265.74°W / -48.66; -265.74 (Svarog Patera)	124.03	Yes
	Talos (Greek)	26°23′S 354°45′W / 26.39°S 354.75°W / -26.39; -354.75 (Talos Patera)	24.67	No
	Taranis (Celtic)	71°22′S 25°32′W / 71.37°S 25.53°W / -71.37; -25.53 (Taranis Patera)	130.67	No
	(Monguor)	33°39′S 358°22′W / 33.65°S 358.37°W / -33.65; -358.37 (Taw Patera)	4.74	No
Tawhaki Patera	Tawhaki (Maori)	3°19′N 76°11′W / 3.32°N 76.18°W / 3.32; -76.18 (Tawhaki Patera)	49.85	Yes
Thomagata Patera	Thomagata (Muisca)	25°40′N 165°56′W / 25.67°N 165.94°W / 25.67; -165.94 (Thomagata Patera)	59.0	No
	(Chinese)	12°19′N 134°18′W / 12.31°N 134.3°W / 12.31; -134.3 (Tawhaki Patera)	28.0	Yes
	Tiermes (Sami)	22°23′N 349°57′W / 22.38°N 349.95°W / 22.38; -349.95 (Tiermes Patera)	79.76	No
	Tohil (Mayan)	25°38′S 158°40′W / 25.63°S 158.66°W / -25.63; -158.66 (Tohil Patera)	76.59	No
	(Mordvin people of Russia)	1°48′N 322°08′W / 1.8°N 322.14°W / 1.8; -322.14 (Tol-Ava Patera)	84.53	No
	(Chinese)	18°16′S 0°56′W / 18.27°S 0.93°W / -18.27; -0.93 (Tung Yo Patera)	59.68	No
Tupan Patera	the thunder god Tupan of the Tupí-Guaraní people of Brazil[5]	18°44′S 141°08′W / 18.73°S 141.13°W / -18.73; -141.13 (Tupan Patera)	79.13	Yes
Tvashtar Paterae	Tvashtri (Hindu)	62°46′N 123°32′W / 62.76°N 123.53°W / 62.76; -123.53 (Tvashtar Paterae)	306.19	Yes
	Ukko (Finnish)	30°57′N 18°25′W / 30.95°N 18.41°W / 30.95; -18.41 (Ukko Patera)	35.25	Yes?[4]
	Ülgen (Siberian)	40°51′S 287°19′W / 40.85°S 287.31°W / -40.85; -287.31 (Ülgen Patera)	43.89	Yes
	Utu (Sumerian)	35°52′S 22°24′W / 35.86°S 22.4°W / -35.86; -22.4 (Uta Patera)	43.89	Yes
	Vahagn (Armenian)	24°07′S 350°45′W / 24.11°S 350.75°W / -24.11; -350.75 (Vahagn Patera)	99.6	No
Viracocha Patera	Viracocha (Inca)	61°46′S 280°05′W / 61.77°S 280.09°W / -61.77; -280.09 (Viracocha Patera)	59.3	Yes
	Vivasvant (Hindu)	75°08′N 293°59′W / 75.14°N 293.98°W / 75.14; -293.98 (Vivasvant Patera)	83.19	Yes
	Wabasso (Potawatomi people of North America)	22°54′S 166°42′W / 22.9°S 166.7°W / -22.9; -166.7 (Wabasso Patera)	32.0	No
	Wayland the Smith (Germanic)	32°48′S 225°14′W / 32.8°S 225.23°W / -32.8; -225.23 (Wayland Patera)	63.37	Yes
	Yaw (Hebrew)	9°54′N 132°12′W / 9.9°N 132.2°W / 9.9; -132.2 (Yaw Patera)	39.0	Yes
	Zal (Persian)	40°15′N 74°30′W / 40.25°N 74.5°W / 40.25; -74.5 (Zal Patera)	165.94	Yes

Lava flows[]

Ionian (areas of lava flow) are named after fire and thunder gods in various mythologies, or after locations in Greek mythology associated with Io. Coordinate, length, and name source come from the IAU's Solar System Nomenclature Website.^[1] Notes on whether the lava flow has been observed as part of an active volcano by either ground-based astronomers, the Hubble Space Telescope, or the various spacecraft that have encountered the Jupiter system come from the book, Volcanism on Io, unless otherwise noted.^[2]

Fluctus	Named after	Coordinates	Length	Activity Observed
	Acala (Buddhism)	8°58′N 334°35′W / 8.97°N 334.59°W / 8.97; -334.59 (Acala Fluctus)	411.11 km	Yes
	Arinna (Hittite)	31°14′N 149°10′W / 31.24°N 149.16°W / 31.24; -149.16 (Arinna Fluctus)	121.94 km	Yes
	Donar (Germanic)	22°40′N 187°38′W / 22.67°N 187.63°W / 22.67; -187.63 (Donar Fluctus)	222.47 km	Yes
	Euboea (Greek)	45°01′S 350°58′W / 45.01°S 350.96°W / -45.01; -350.96 (Euboea Fluctūs)	104.82 km	No
	Fjorgyn (Norse)	11°14′N 358°05′W / 11.23°N 358.08°W / 11.23; -358.08 (Fjorgynn Fluctus)	414.07 km	Yes
	Kāne Milohai (Hawaiian)	17°41′S 33°34′W / 17.68°S 33.56°W / -17.68; -33.56 (Kanehekili Fluctus)	243.47 km	Yes
	Lei Gong (Chinese)	40°24′N 206°28′W / 40.4°N 206.47°W / 40.4; -206.47 (Lei-Kung Fluctus)	386.17 km	Yes
	Lei Zi (Chinese)	14°15′N 46°10′W / 14.25°N 46.16°W / 14.25; -46.16 (Lei-zi Fluctus)	361.1 km	No
	Marduk (Sumerian)	27°35′S 210°50′W / 27.59°S 210.83°W / -27.59; -210.83 (Marduk Fluctus)	169.43 km	Yes
Masubi Fluctus	Ho-Masubi (Japanese)	50°29′S 58°08′W / 50.49°S 58.13°W / -50.49; -58.13 (Masubi Fluctus)	501.33 km	Yes
	Sobo (Vodou)	14°05′N 150°35′W / 14.08°N 150.59°W / 14.08; -150.59 (Sobo Fluctus)	58.83 km	Yes
	(Khoikhoi)	1°24′S 163°24′W / 1.4°S 163.4°W / -1.4; -163.4 (Tsũi Goab Fluctus)	117.0 km	Yes
	(Chinese)	16°36′S 356°29′W / 16.6°S 356.49°W / -16.6; -356.49 (Tung Yo Fluctus)	459.37 km	No
	Utu (Sumerian)	33°03′S 16°39′W / 33.05°S 16.65°W / -33.05; -16.65 (Uta Fluctus)	332.31 km	No

Shield volcanoes[]

Ionian shield volcanoes or tholi are named after mythological figures associated with fire or with the nymph Io.

Tholus	Named after	Coordinates	Length	Height
	Apis (Greek)	10°54′S 347°53′W / 10.9°S 347.88��W / -10.9; -347.88 (Apis Tholus)	145.71 km	N/A
	Inachus (Greek)	16°11′S 347°46′W / 16.18°S 347.76°W / -16.18; -347.76 (Inachus Tholus)	176.96 km	1.8 km[6]
	(Khoikhoi)	0°06′S 163°00′W / 0.1°S 163.0°W / -0.1; -163.0 (Tsũi Goab Tholus)	53.0 km	0.8 km[7]

Lava channels[]

Ionian lava channels that cut into the surrounding terrain use the term vallis.

Vallis	Named after	Coordinates	Length
Tawhaki Vallis	Tawhaki (Maori)	0°30′N 72°48′W / 0.5°N 72.8°W / 0.5; -72.8 (Tawhaki Vallis)	190.0 kilometer (km)

References[]

• USGS Planetary Nomenclature: Io