Mount Si (pronounced sigh) is a small mountain in the U.S. state of Washington. Although just 4,167 ft (1,270 m) high, it lies on the western margin of the Cascade Range just above the coastal plains around Puget Sound, and towers over the nearby town of North Bend. The mountain was named after local homesteader Josiah “Uncle Si” Merritt. It was made famous in the show Twin Peaks, which was filmed in North Bend.

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