Nubanusit Brook is a 14.3 miles (23 km) stream

Stream

A stream is a body of water with a current, confined within a bed and stream banks. Depending on its locale or certain characteristics, a stream may be referred to as a branch, brook, beck, burn, creek, "crick", gill , kill, lick, rill, river, syke, bayou, rivulet, streamage, wash, run or...

 located in southern 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...

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. It is a tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 of the Contoocook River

Contoocook River

The Contoocook River is a river in New Hampshire. It flows from Pool Pond and Contoocook Lake on the Jaffrey/Rindge border to Penacook , where it empties into the Merrimack River. It is one of only a few rivers in New Hampshire that flow in a predominantly northward direction...

, part of 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...

 watershed

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

.

Nubanusit Brook begins at the outlet of Nubanusit Lake

Nubanusit Lake

Nubanusit Lake is a lake located on the border between Cheshire and Hillsborough counties in southwestern New Hampshire, United States, in the towns of Nelson and Hancock. The outlet of the lake is Nubanusit Brook, a tributary of the Contoocook River in the Merrimack River drainage basin....

 in Nelson, New Hampshire

Nelson, New Hampshire

Nelson is a town in Cheshire County, New Hampshire, United States. The population was 729 at the 2010 census. Nelson includes the village of Munsonville.-History:...

. The brook flows south into Harrisville

Harrisville, New Hampshire

Harrisville is a town in Cheshire County, New Hampshire, United States. Besides the town center, it also includes the village of Chesham. The population of the town was 961 at the 2010 census....

, interrupted by Harrisville Pond

Harrisville Pond

Harrisville Pond is a water body located in Cheshire County in southwestern New Hampshire, in the town of Harrisville. It is one of many lakes and ponds along Nubanusit Brook. Water from Nubanusit Lake flows via the Great Meadows into the pond on the north side and out of the pond at two dams on...

 and Skatutakee Lake

Skatutakee Lake

Skatutakee Lake is a water body located in Cheshire County in southwestern New Hampshire, in the town of Harrisville. Water from Skatutakee Lake flows via Nubanusit Brook to the Contoocook River in Peterborough, New Hampshire and ultimately to the Merrimack River....

, then flows east to the MacDowell Reservoir (constructed for flood control) in Peterborough

Peterborough, New Hampshire

Peterborough is a town in Hillsborough County, New Hampshire, United States. The population was 6,284 at the 2010 census. Home to the MacDowell Art Colony, the town is a popular tourist destination....

. The brook turns south, passes the village of West Peterborough, and reaches the Contoocook River after passing through Peterborough village and over several mill dams.