Traditionally it was one of the hunting grounds of the Inuit, but there are archaeological remains of more permanent human habitation in ancient times.

Washington Land is located to the west of Daugaard-Jensen Land, between the Kane Basin in the west and northwest and Peabody Bay in the south.

The Cass Fjord forms the peninsula's southeastern coastline, across which is the Humboldt Glacier and beyond it Inglefield Land.

The Aleqatsiaq Fjord forms the limit of its northern shore.

Cape Jackson is Washington Land's south-westernmost headland and protrudes at the junction of the Kennedy Channel and the Kane Basin.