A Natural Area of Special Interest (Spanish: Área Natural de Especial Interés, Catalan: Área natural d'especial interès; acronym: ANEI) is a protected area within the Balearic Islands, Spain that is below the level of a .
The law creating ANEIs, Law 1/1991, enacted on January 30, designated 47 ANEIs in Mallorca, 19 on Menorca, 10 on Ibiza and 8 on Formentera.