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 Monongahela National Forest includes some major landform features such as the Allegheny Front and the western portion of the Ridge-and-valley Appalachians. Within the forest boundaries lie some of the highest mountain peaks in the state, including the highest, Spruce Knob. Spruce Knob is also the highest point in the Allegheny Mountains. Approximately 75 tree species are found in the forest. Almost all of the trees are a second growth forest, grown back after the land was heavily cutover around the start of the 20th century. Species for which the forest is important include red spruce, balsam fir, and mountain ash.
The Monongahela National Forest includes eight U.S. Wilderness Areas and several special-use areas, notably the Spruce Knob-Seneca Rocks National Recreation Area.