Island Park is actually the world's largest crater, 23 miles in diameter, created from a volcano which collapsed in prehistoric times. Now covered in a dense forest of pine and wildflowers, it is a Mecca for hiking & fishing in summer and cross-country skiing & snowmobiling in winter. The 7000-acre reservoir is popular for fishing - summer and winter. Anglers catch rainbow, brook, and cutthroat trout; kokanee; and whitefish. Fuel, parking, docks, and camp sites are all available.
Eastern Idaho, NE of Rexburg
Hwy. 20, 30 mi. N. of Ashton