Where is the Montana Trail 406 located?

The Montana Trail 406 is located completely in Montana. It has a west-east orientation and stretches from the Idaho-Montana border to near the U.S.-Canada to near the Wyoming-Montana border to the North Dakota-Montana border. The 1,700-mile trail route runs along much of the Continental Divide within Montana, including trails through Glacier National Park and very close to Yellowstone National Park traversing many of the island mountain ranges of central Montana. The route continues east along, and on, the Missouri River, crossing the great short grass prairie of eastern Montana to finish at Fort Union, the eastern terminus of the route.