[2][3] The northern shore facing the Lincoln sea slopes evenly and is fertile for the area, being the northernmost limit of certain plant species.

[6] American geologist William E. Davies called the wider range north of J.P. Koch Fjord and Frederick E. Hyde Fjord the "Nansen-Jensen Alps", with the westernmost foothills in Nansen Land, stretching past the De Long Fjord area across Roosevelt Land and the Roosevelt Range, and reaching all the way to Johannes V. Jensen Land in the east.

The westernmost headland is Cape Payer and the northernmost headland is Cape Mohn, the northern end of an island at the entrance of De Long Fjord, separated from Nansen Land by a narrow sound.

To the southeast lies the Hans Tausen Ice Cap and to the south the Sirius Pass, a broad valley connecting J.P. Koch Fjord in the west and Brainard Sund in the east in the area where the peninsula is attached to the mainland and its ice cap.

[9] Elevations reaching 1,320 metres (4,331 ft) are found in the central part of the peninsula.