Flathead Lake is the largest freshwater lake in the western United States, with over 200 square miles of water and around 85 miles of shoreline. It is considered one of the cleanest lakes in the world. The lake is bordered by the Salish Mountains to the west and the Mission Mountains to the east.
A number of public access sites along Flathead Lake are maintained by Montana Fish Wildlife and Parks. These include fishing access sites and state recreation areas. The recreation areas have boat launches, picnic facilities, camping areas, and toilets. Wild Horse Island, located near Flathead Lake's Big Arm Bay, is a state park that only has picnic facilities. The island can be accessed by boat, and is reserved for day use, only.
Flathead Lake offers a variety of recreational activities. Fishing, especially trout fishing, is extremely popular. In addition to fishing for trout, you can fish for whitefish, bass, pike, and yellow perch. Boating is common activity on Flathead Lake. You can bring your own boat, and use one of the several public boat launches available. Or, you can take a guided boat tour of the lake and it's unique islands.