The Newfoundland Mountains are a 20-mile long mountain range located in southern Box Elder County, Utah, United States. The range is the only 'island' mountain range encircled by the Great Salt Lake Desert salt flat. Other ranges protrude into the desert salt flat, the Silver Island and Dugway Ranges being the premiere examples. Other individual mou…The Newfoundland Mountains are a 20-mile long mountain range located in southern Box Elder County, Utah, United States. The range is the only 'island' mountain range encircled by the Great Salt Lake Desert salt flat. Other ranges protrude into the desert salt flat, the Silver Island and Dugway Ranges being the premiere examples. Other individual mountains also arise as 'island' peaks, or mountains in the salt flat desert itself, most notably Granite Mountain in the south desert, and Wildcat Mountain to its north. Granite Mountain lies at the north of the Dugway Range.