Vandalia is located on the Milk River between Glasgow and Saco. Nearby Fort Peck Reservoir is Montana's largest body of water and is more than 134 miles in length with more than 50 different kinds of fish. Surrounding this large expanse of water is the Charles M. Russell (CMR) National Wildlife Refuge, which provides over one million acres of public land for fishing, hiking, hunting, camping, bird-watching, and other outdoor recreation.