Over 1800 square miles (4660 sq. km) of the rugged Rocky Mountains are found within the boundaries of Waterton-Glacier International Peace Park. Two mountain ranges, the Livingston and the more easterly Lewis Range trend from northwest to southeast through Glacier. The Continental Divide follows the crest of the Lewis Range. Elevation varies from a low of 3150 feet (960 m) at the junction of the Middle and North Forks of the Flathead River (near the Lake McDonald valley to a high of 10,466 feet (3192 m) on Mt. Cleveland. There are 6 peaks over 10,000 feet (3050 m) and 32 peaks over 9100 feet (2770 m) found in Glacier National Park. The impressive mountains and valleys within the park are the result of approximately 1.6 billion years of earth history and a number of geologic processes, including, erosion, sediment deposition, uplift and thrust faulting and glaciation Waterton-Glacier is a geologic park. The geologic processes happened in three stages: