Amsler Island is located off the coast of the Antarctic Peninsula. It is named after American marine biologists Charles (Chuck) and Margaret (Maggie) Amsler of the University of Alabama at Birmingham. The island is a triangular rocky plot of granite land approximately 2.1 km (1.3 mi) long and 1 km (0.6 mi) wide at its widest point. It was once thought to be part of a larger island known as Anvers Island because the gap between the islands was covered by the Marr Ice Piedmont. Rapid recession of the ice due to global warming revealed this as a separate island in 2004. The United States Board on Geographic Names chose this name in 2007 in recognition of the Amslers' three decades of research in the Anvers Island area.