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A row of mountains is called a mountain range. This term refers to a series of connected mountains or hills that form a continuous elevated line. Mountain ranges can span great distances and often have distinct peaks and valleys.
Most often it would be called a valley or canyon. It might also be called a gorge if there is water running thru it. It might also be called a mountain pass.
A low hill at the base of a mountain is typically called a foothill. It serves as a transition between the flatlands and the more rugged terrain of the mountain. Foothills are often characterized by gentle slopes and can be rich in vegetation.
Natural selection
The low area between hills or mountain ranges is known as a valley. Often, cities are established in valleys because they are easy to reach, and are afforded the protection of being at the base of a mountain.
Where a river starts often high in a mountain is called a headwater. It usually doesn't start in one specific place, but in many locations high in the mountains.
A submerged mountain is often called a seamount. These mountains originate at the ocean's floor and does not reach sea level.
Tornadoes are usually preceded or shrouded by heavy rain and often by hail.
Source
A guy called Paul, often referred to as Saint Paul. (on the mountain of Areopagus)
it often begins with a capital letter.
Complication
The Balkan Mountain range (in Bulgaria Balkan Mountain is often called the 'Stara Planina' Mountains)
The famous mountain range in county Down is the Mourne Mountains, often just called the mountains of Mourne. The highest of these is Slieve Donard.
Most often it would be called a valley or canyon. It might also be called a gorge if there is water running thru it. It might also be called a mountain pass.
Ural Mountains.
Ural Mountains