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. The area is populated with varied wildlife and offers scenic views of the fifteen-mile wide lake. The town of Big Arm is also near Wild Horse Island, 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 lake.