Summit

The highest elevation summit, Mount Everest, shown with a climber at the summit wearing an oxygen mask. The summit is 8850 m (29,035 ft) elevation. (While the cruising altitude of jetliners is roughly 10,000 m (32,808 feet), they are pressurized.)

View from the summit of Switzerland's highest, Monte Rosa

A summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. Mathematically, a summit is a local maximum in elevation. The topographic terms "acme", "apex", "peak", and "zenith" are synonyms.

Definition[edit]

The term "summit" is generally only used for a mountain peak with some significant amount of topographic prominence (height above the lowest point en route to the nearest higher peak) or topographic isolation (distance from the nearest point of higher elevation); for example, a boulder next to the main summit of a mountain is not considered a summit. Summits near a higher peak, with some prominence or isolation, but not reaching a certain cutoff value for these quantities, are often considered subsummits (or subpeaks) of the higher peak, and are considered as part of the same mountain. The UIAA definition is that a summit is independent if it has a prominence of 30 metres (98 ft) or more; it is a mountain if it has a prominence of at least 300 metres (980 ft). This can be summarised as follows:

Term	Prominence	Isolation
Subpeak	< 30 m	? m
Independent peak or summit	30 m or more	? m
Mountain	300 m or more	? m

A pyramidal peak is an exaggerated form produced by ice erosion of a mountain top. Summit may also refer to the highest point along a line, trail, or route.

The summit of Mount Damavand, Iran, in winter

Jeff Davis Peak, one of the highest peaks entirely within Nevada

Mount Elbrus and its two peaks (Caucasus, Russia)

Western United States[edit]

Siskiyou Mountain Summit sign along Interstate 5, marking the highest point along the highway

In many parts of the western United States, the term summit refers to the highest point along a road, highway, or railroad. For example, the highest point along Interstate 80 in California is referred to as Donner Summit (not to be confused with Donner Pass, which is located just to the south), while the highest point on Interstate 5 is Sikiyou Mountain Summit.