The southern part of the Canadian Cascades, particularly the Skagit Range, is geologically and topographically similar to the North Cascades, while the northern and northeastern parts are less glaciated and more plateau-like, resembling nearby areas of the Thompson Plateau. Overall, the North Cascades and Canadian Cascades are extremely rugged even the lesser peaks are steep and glaciated, and valleys are quite low relative to peaks and ridges, so there is great local relief. The northern part of the range, north of Mount Rainier, is known as the North Cascades in the United States but is formally named the Cascade Mountains north of the Canada–United States border, reaching to the northern extremity of the Cascades at Lytton Mountain. The highest peaks, such as the 14,411-foot (4,392 m) Mount Rainier, dominate their surroundings for 50 to 100 miles (80 to 161 km). They often have a visual height (height above nearby crestlines) of one mile or more. The highest volcanoes of the Cascades, known as the High Cascades, dominate their surroundings, often standing twice the height of the nearby mountains. The Fraser River separates the Cascades from the Coast Mountains in Canada, as does the Willamette Valley from the upper portion of the Oregon Coast Range. The Cascades extend northward from Lassen Peak (also known as Mount Lassen) in northern California to the confluence of the Nicola and Thompson rivers in British Columbia. Map of the Cascade Range showing major volcanic peaks The northern half of the Pacific Crest Trail follows the range. The Cascades are home to many national parks and protected areas, including North Cascades National Park, Mount Rainer National Park, Crater Lake National Park, and Lassen Volcanic National Park. The Cascade Range is a part of the American Cordillera, a nearly continuous chain of mountain ranges (cordillera) that form the western "backbone" of North, Central, and South America. Helens have also occurred since, most recently from 2004 to 2008. The two most recent were Lassen Peak from 1914 to 1921 and a major eruption of Mount St. All of the eruptions in the contiguous United States over the last 200 years have been from Cascade volcanoes. The Cascades are part of the Pacific Ocean's Ring of Fire, the ring of volcanoes and associated mountains around the Pacific Ocean. The highest peak in the range is Mount Rainier in Washington at 14,411 feet (4,392 m). ![]() The small part of the range in British Columbia is referred to as the Canadian Cascades or, locally, as the Cascade Mountains. It includes both non-volcanic mountains, such as many of those in the North Cascades, and the notable volcanoes known as the High Cascades. The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California.
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