[2] The spinal range splits in two to the northwest of the base of the peninsula, with the southern arm forming the coastal range, the central arm almost entirely glaciated, and continuing northwest the entire length of the peninsula.

The two arms are dissected by a deep Kuussuaq Valley, partially filled in the center with Sarqap Tassersuaq, a glacial, emerald lake.

Archaeological excavations in Qilakitsoq on the southwestern shore revealed the existence of an ancient Arctic culture later named the Saqqaq culture that inhabited the area of west-central Greenland between 2500 BCE and 800 BCE.

[4] The world's largest fossil mollusk, Inoceramus steenstrup, was found in 1952 in Qilakitsoq Valley on the peninsula.

Major landslides have occurred along the southern coast of the peninsula since prehistoric times, sometimes generating tsunamis or megatsunamis in Sullorsuaq Strait: