The Mahoosuc Range, a northern extension of the White Mountains, straddles the border between New Hampshire and Maine. The range's highest peak, 4170 ft 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. The Appalachian Trail traverses the main ridge of the Mahoosucs between Shelburne, New Hampshire and Grafton Notch in Maine. Mahoosuc Notch, considered one of the most difficult sections of the Appalachian Trail, cuts a deep cleft in the middle of the range between Mahoosuc Mountain and Fulling Mill Mountain.

Mountains

(from north to south)