Mount Watatic is a 1,832 foot (558 m) monadnock located on the Massachusetts-New Hampshire border, at the southern end of the Wapack Range of mountains. It lies within Ashburnham, Massachusetts, Ashby, Massachusetts, and New Ipswich, New Hampshire; the 22 miles (35 km) Wapack Trail and the 92 miles (148 km) Midstate Trail both cross the mountain.