The Mahoosuc Range, a northern extension of the White Mountains, straddles the border between New Hampshire and Maine. The range's highest peak, 4,170-foot (1,270 m) Old Speck Mountain, is the fifth-highest peak in Maine. Substantial parts of the range are publicly owned as parts of the National Park Service Appalachian Trail corridor and Grafton Notch State Park in Maine. The range is a subrange of the Appalachian Mountains.