Important Mountain Passes of India 3D Animation |Ladakh, J&K | Indian geography L28 | SSC exam

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A mountain pass is a navigable route through a mountain range or over a ridge. Since mountain ranges can present formidable barriers to travel, passes have played a key role in trade, war, and both human and animal migration throughout history. At lower elevations it may be called a hill pass. A mountain pass is typically formed between two volcanic peaks or created by erosion from water or wind.

Overview

Idealised mountain pass represented as the green line; the saddle point is in red.
Mountain passes make use of a gap, saddle, col or notch. A topographic saddle is analogous to the mathematical concept of a saddle surface, with a saddle point marking the minimum high point between two valleys and the lowest point along a ridge.[2][3] On a topographic map, passes are characterized by contour lines with an hourglass shape, which indicates a low spot between two higher points.[4] In the high mountains, a difference of 2,000 meters (6,600 ft) between the summit and the mountain is defined as a mountain pass.[5]

Passes are often found just above the source of a river, constituting a drainage divide. A pass may be very short, consisting of steep slopes to the top of the pass, or a valley many kilometers long, whose highest point might only be identifiable by surveying.

Roads and railways have long been built through passes. Some high and rugged passes may have tunnels bored underneath a nearby mountainside, as with the Eisenhower Tunnel bypassing Loveland Pass in the Rockies, to allow faster traffic flow throughout the year.

The top of a pass is frequently the only flat ground in the area, and is a high vantage point. In some cases this makes it a preferred site for buildings. If a national border follows a mountain range, a pass over the mountains is typically on the border, and there may be a border control or customs station, and possibly a military post. For instance, Argentina and Chile share the world's third-longest international border, 5,300 kilometres (3,300 mi) long, which runs north–south along the Andes mountains including 42 mountain passes.[6][7]

On a road over a pass, it is customary to have a small roadside sign giving the name of the pass and its elevation above mean sea level.




Synonyms

Col between Kensgriff and Yarlsidine in the Howgill Fells, England
There are many words for pass in the English-speaking world. In the United States, pass is very common in the West, the word gap is common in the southern Appalachians, notch in parts of New England, and saddle in northern Idaho.[8] The term col, derived from Old French, is also used, particularly in Europe.

In the highest mountain range in the world, the Himalayas, passes are denoted by the suffix "La" in Tibetan, Ladhakhi, and several other regional languages. Examples are the Taglang La at 5,328 m (17,480 ft) on the Leh-Manali highway, or the Sia La at 5,589 m (18,337 ft) in the Eastern Karakoram range.



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Important Mountain Passes of India 3D Animation | Indian geography L28 | SSC exam