The Monongahela National Forest is a national forest located in the Allegheny Mountains of eastern West Virginia, USA. It protects over 921,000 acres of federally owned land within a 1,700,000 acres proclamation boundary that includes much of the Potomac Highlands Region and portions of 10 counties. The MNF includes some major landform features such as the Allegheny Front and the western portion of the Ridge-and-valley Appalachians.