The sea of Lincoln is part of the Arctic Ocean, extending from the Cape Columbia in the west with the Cape Morris Jesup, along the north-western coast of the Greenland and in the north of the island Ellesmere (Canadian Arctic Archipel) in the east. It is taken in the ices all the year, one finds there the ice thickest of all the Arctic Ocean, being able to exceed the 15 meters thickness. The funds vary from 100 to 300 m of depth. Water of the Channel Robeson, left most septentrional the Strait of Nares, is thrown in this sea.

The sea was named in homage to Robert Todd Lincoln, then American Secretary of State to the war, during an Arctic forwarding of Adolphus W. Greely, between 1881 and 1884, in the Baie Franklin.