It is 27 kilometres (17 mi) long, lying immediately north of Joinville Island, from which it is separated by Larsen Channel.[2] The single island was charted in 1902 by the Swedish Antarctic Expedition (SwedAE) under Otto Nordenskiöld, who named it for Captain Jules Dumont d'Urville, French explorer who discovered land in the Joinville Island group.Surveys by FIDS (1952-54) and aerial photographs by FIDASE (1956-57) have not revealed a definable point hereabout.The largest of a group of rocks lying east of Cape Juncal, D'Urville Island.A group of reefs and rocks lying close off the northeast side of D'Urville Island.[11] This article incorporates public domain material from websites or documents of the United States Geological Survey.