A spur is a lateral ridge or tongue of land descending from a hill, mountain or main crest of a ridge. Sometimes the term is used in sense of subpeak. == Examples == Examples of spurs are: Abbott Spur, which separates the lower ends of Rutgers Glacier and Allison Glacier on the west side of the Royal Society Range in Victoria Land, Antarctica Boott Spur, a subpeak of Mount Washington Kelley Spur, 2 nautical miles (3.7 km) east of Spear Spur on the south side of Dufek Massif in the Pensacola Mountains, Antarctica == See also == Draw or re-entrant, the low ground between two spurs. == R...

An arête is a thin, almost knife-like, ridge of rock which is typically formed when two glaciers erode parallel U-shaped valleys. The arête is a thin ridge of rock that is left separating the two valleys. Arêtes can also form when two glacial cirques erode headwards towards one another, although frequently this results in a saddle-shaped pass, called a col. The edge is then sharpened by freeze-thaw weathering, and the slope on either side of the arete steepened through mass wasting events and the erosion of exposed, unstable rock. The word "arête" is actually French for edge or ridge; simil...