Ahlmann Ridge
Knerten Rock () is a small isolated rock north of Vesleskarvet Cliff, in the northwest part of Ahlmann Ridge in Queen Maud Land, Antarctica. It was mapped by Norwegian cartographers from surveys and air photos by the Norwegian–British–Swedish Antarctic Expedition (NBSAE) (1949–52) and air photos by the Norwegian expedition (1958–59) and named Knerten (the nipper).