Mountain pass

The mountain peaks of mountain ranges are separated by relatively lower sections, called a mountain pass. The most useful mountain passes are the relatively low mountain passes that have been carved lower through erosion by flowing water, or glaciers. Glacial meltwater from Lake Iroquois helped carve a pass through the Appalachian Mountains, so the Mohawk River could drain through the Hudson River to the Atlantic Ocean. Kicking Horse Pass, Yellowhead Pass, Donner Pass, Crowsnest Pass and Logan Pass, are all passes across parts of North America's Rocky Mountains.