Big Arm is located twelve miles north of Polson on the "big arm" of Flathead Lake, the largest natural freshwater lake in the western United States. Big Arm State Park, the largest park on Flathead Lake, is less than five miles north of Big Arm on Highway 93. The area is populated with varied wildlife and offers scenic views of the fifteen-mile-wide lake from pebbled beaches, and picnicking, camping, and scuba diving are popular in the park. The town of Big Arm is also near Wild Horse Island State Park, where Salish-Kootenai Indians once pastured their horses to keep them from being stolen by other tribes. Enjoy swimming, fishing, sailing and boating on the beautiful Flathead Lake!