Island, with an area of 42 square miles (68 km²), is the largest island in the Great Salt Lake, the largest lake in the Western United States.The island lies entirely within Davis County, in the southeastern portion of the lake and becomes a peninsula when the lake is at extremely low levels. Antelope Island holds populations of pronghorn antelope, bighorn sheep, 800 American Bison and millions of waterfowl. The Bison were introduced to the island in 1893, and have proven to be a valuable genetic pool for Bison breeding and conservation purposes.
Antelope Island State Park is a state park located on the northern portion of the island, established in 1981, part of the Utah State Parks System. The island is accessible via a 7 mile (11 km) causeway from West Point in Davis County. Access from I-15 is via Exit 332, Syracuse/Antelope Drive. The island’s shore is mostly (all but west side of the island), relatively flat with beaches and plains to the base of the mountains on the island. These steep mountains are visible from most of the northern Wasatch Front, reaching a maximum elevation of 6,596 ft (2,010 m), which is about 2,500 feet above the level of the lake.