 Mio is about due East of Grayling, Michigan and about due North of West Branch, Michigan.The majority of the trail system is contained within the Huron-Manistee National Forest and has parts of the Au Sable River passing through.The Huron-Manistee National Forest, in the northern part of Michigan's Lower Peninsula, provides ORV enthusiasts an opportunity to ride off-road vehicles on superb forest trails.