The Sourdough Mountains, also called Sourdough Ridge,[1] is a mountain ridge on the northeast side of Mount Rainier in Mount Rainier National Park, Washington, United States.
The range forms an L-shape, starting at Mount Fremont, running east to Dege Peak, turning north to Slide Mountain.
The ridge is a popular hiking destination, due to the excellent view of Mount Rainier and its proximity to roads and the Sunrise Visitor Center.
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