Sulphide Glacier lies on the south slopes of Mount Shuksan in North Cascades National Park, extending about 1.85 miles from the summit tower and descending from roughly 8,600 to 5,600 feet, with Crystal Glacier adjoining it on the east. Together, these glaciers feed the cascades known as Sulphide Basin Falls, and below them Sulphide Lake drains into Sulphide Creek Falls, a nearly 2,200-foot plunge considered one of North America’s highest waterfalls. Beyond its striking alpine setting, the glacier also figured in Mount Shuksan’s first ascent in 1906, when climbers used the route across it.