Mount Si (pronounced /saɪ/; Lushootseed: q̓əlbc, CULB-ts)[3] is a mountain in the northwest United States, east of Seattle, Washington.

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 became nationally familiar in the early 1990s with the television series Twin Peaks, which was filmed in North Bend.

[4][5] The four-mile-long (6.5 km) Mount Si trail vertically climbs 3,500 feet (1,070 m) to the summit ridge.

Awakening to find his possessions stolen, Moon chased Coyote down the cedar rope in anger, but it broke and he fell to his death, forming the mountain.