冰原岛峰是指在环绕的冰川中突出而且没被陆冰覆盖的山顶。冰原岛峰的野生动物或会被冰川阻隔，就像海洋中的岛屿。冰原岛峰一般为带菱角和锯齿状的，是冻融侵蚀所造成，而下方受冰川侵蚀的土地轮廓比较柔和。冰川退缩时，冰原岛峰和下方的土地形成强烈对比。

A nunatak (from Inuit nunataq) is an exposed, often rocky element of a ridge, mountain, or peak not covered with ice or snow within (or at the edge of) an ice field or glacier. They are also called glacial islands.

The term is typically used in areas where a permanent ice sheet is present. Nunataks present readily identifiable landmark reference points in glaciers or ice caps and are often named.