Gastropods are distributed throughout the ocean, and on land, essentially everywhere except the most extreme polar regions. They occur as far north as Point Barrow, Alaska (USA) at 71°23′20″N (J. Nekola, personal communication, January 17, 2011) and as far south as the sub-Antarctic islands (Solem & van Bruggen, 1984).  They do not occur on the Antarctic continent.