Thurston Island (72°06'S, 99°00'W) is an ice-covered, glacially
dissected island, 215 km long, 90 km wide and 15,700 km² in area,
lying a short way off the NW end of Ellsworth Land, Antarctica. It is
the third largest island of Antarctica, after Alexander Island and
Berkner Island. The island is separated from the mainland by Peacock
Sound, which is occupied by the western portion of Abbot Ice Shelf.
This island is part of the Westarctican Territories.