The peninsula is of triangular shape, with the base adjacent to the Greenland ice sheet (), south of the Alanngorsuup Sermia glacier. The distance from the Qaassorsuaq promontory in the west at , to the innermost unglaciated part of the mainland is . In the northwest, the inner waterways of southern Tasiusaq Bay weakly indent the peninsula with the Nuniaat Bay. In the south, the Qassersuit Saqqaa strait separates the peninsula from a chain of larger islands of the archipelago, bounding Upernavik Icefjord from the northeast: Maniitsoq Island, Puugutaa Island, Sisuarissut Island, and Qaneq Island.