New Ipswich Mountain is a 1881 feet (573.3 m) monadnock

Monadnock

A monadnock or inselberg is an isolated rock hill, knob, ridge, or small mountain that rises abruptly from a gently sloping or virtually level surrounding plain...

 located in south-central New Hampshire

New Hampshire

New Hampshire is a state in the New England region of the northeastern United States of America. The state was named after the southern English county of Hampshire. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Atlantic Ocean to the east, and the Canadian...

 within the Wapack Range

Wapack Range

The Wapack Range, sometimes referred to as the Pack Monadnock Range, is a 20-mile range of mountains in south-central New Hampshire and adjacent Massachusetts. The range is considered very scenic and rugged with many bare summits and ledges ranging from 1,800 feet to 2,290 feet. The 22 mile Wapack...

 of mountains. It lies within the town of New Ipswich

New Ipswich, New Hampshire

New Ipswich is a town in Hillsborough County, New Hampshire, United States. The population was 5,099 at the 2010 census. New Ipswich, situated on the Massachusetts border, includes the villages of Bank, Davis, Gibson Four Corners, Highbridge, New Ipswich Center, Smithville, and Wilder, though these...

 and is traversed by the 22 mi (35.4 km) Wapack Trail

Wapack Trail

The Wapack Trail is one of the oldest public, interstate hiking trails in the United States. Opened in 1923, it follows the Wapack Range north-south for , between Mount Watatic in Ashburnham, Massachusetts and North Pack Monadnock mountain in Greenfield, New Hampshire...

. Barrett Mountain

Barrett Mountain

Barrett Mountain is a mountain located in south-central New Hampshire within the Wapack Range of mountains. It lies within the town of New Ipswich and is traversed by the Wapack Trail. Kidder Mountain is located directly to the north along the Wapack ridgeline; New Ipswich Mountain to the south....

 is located directly to the north along the Wapack ridgeline; Stony Top, a subordinate peak of Pratt Mountain

Pratt Mountain

Pratt Mountain is a monadnock located in south-central New Hampshire within the Wapack Range of mountains. It lies within the town of New Ipswich and is traversed by the Wapack Trail. The subordinate peak, Stony Top, , forms the north shoulder of the mountain...

, lies to the south. The summit of the mountain is mostly wooded, but a number of rocky ledges below the summit offer views of the surrounding countryside.

The east side of the mountain drains into the Souhegan River

Souhegan River

The Souhegan River is a tributary of the Merrimack River in the northeastern United States. long with a drainage area of , it flows north and east through southern New Hampshire to the Merrimack River....

 watershed, to the Merrimack River

Merrimack River

The Merrimack River is a river in the northeastern United States. It rises at the confluence of the Pemigewasset and Winnipesaukee rivers in Franklin, New Hampshire, flows southward into Massachusetts, and then flows northeast until it empties into the Atlantic Ocean at Newburyport...

 thence the Atlantic Ocean

Atlantic Ocean

The Atlantic Ocean is the second-largest of the world's oceanic divisions. With a total area of about , it covers approximately 20% of the Earth's surface and about 26% of its water surface area...

; the west side drains into the Millers River

Millers River

The Millers River is a river in northern Massachusetts, originating in Ashburnham and joining the Connecticut River just downstream from Millers Falls, Massachusetts...

 watershed, to the Connecticut River

Connecticut River

The Connecticut River is the largest and longest river in New England, and also an American Heritage River. It flows roughly south, starting from the Fourth Connecticut Lake in New Hampshire. After flowing through the remaining Connecticut Lakes and Lake Francis, it defines the border between the...

, thence into Long Island Sound

Long Island Sound

Long Island Sound is an estuary of the Atlantic Ocean, located in the United States between Connecticut to the north and Long Island, New York to the south. The mouth of the Connecticut River at Old Saybrook, Connecticut, empties into the sound. On its western end the sound is bounded by the Bronx...

.