Castor Nunatak (65°10′S 59°55′W / 65.167°S 59.917°W / -65.167; -59.917) is a nunatak 3 nautical miles (6 km) southwest of Oceana Nunatak in the Seal Nunataks group, off the east coast of the Antarctic Peninsula. It was first seen and mapped as an island in December 1893 by a Norwegian Sealing expedition under C.A. Larsen, who named it after the Castor, a ship which combined sealing and exploring activities along the west coast of the Antarctic Peninsula under Captain Morten Pedersen in 1893–94.^[1] The feature was determined to be a nunatak in 1902 by the Swedish Antarctic Expedition under Otto Nordenskiöld.^[2]

Castor Nunatak
Castor Nunatak
Naming
Etymology	Morten Pedersen's sealing and exploration ship, Castor
Geography
Continent	Antarctica
Area	Graham Land
Range coordinates	65°10′S 59°55′W / 65.167°S 59.917°W / -65.167; -59.917
Climbing
First ascent	Swedish Antarctic Expedition (1902)