Gallatin National Forest in southwestern Montana, now managed within the Custer-Gallatin National Forest, stretches along the state’s southern border beside Yellowstone National Park within the Greater Yellowstone Ecosystem. Established in 1899 and later named for Albert Gallatin, it also lies within Indigenous homelands and crossroads with treaty histories far older than the forest itself. Its mountains, wilderness areas, streams, and rivers create a striking landscape that includes Granite Peak, Montana’s highest point, and Quake Lake, formed after the 1959 Madison Canyon earthquake and landslide. With rich plant and animal life, native and introduced fish, and extensive trails and campgrounds, it remains a major recreation area.