Tarbell Brook is a 10.1 mile long (16.2 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 southwestern 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...

 and northern Massachusetts

Massachusetts

The Commonwealth of Massachusetts is a state in the New England region of the northeastern United States of America. It is bordered by Rhode Island and Connecticut to the south, New York to the west, and Vermont and New Hampshire to the north; at its east lies the Atlantic Ocean. As of the 2010...

 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 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...

, itself a tributary of 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...

, which flows to 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...

.

Tarbell Brook rises in the northeast corner of the town of Fitzwilliam, New Hampshire

Fitzwilliam, New Hampshire

Fitzwilliam is a town in Cheshire County, New Hampshire, United States. The population was 2,396 at the 2010 census. Fitzwilliam is home to Rhododendron State Park, a grove of native rhododendrons that bloom in mid-July.-History:...

, and flows generally south through Rindge

Rindge, New Hampshire

Rindge is a town in Cheshire County, New Hampshire, United States. The population was 6,014 at the 2010 census. Rindge is home to Franklin Pierce University, the Cathedral of the Pines, and part of Annett State Forest.-Native American inhabitants:...

 to the Damon Reservoirs. The brook continues south into Winchendon, Massachusetts

Winchendon, Massachusetts

Winchendon is a town in Worcester County, Massachusetts, USA. The population was 10,300 at the 2010 census. Home to Winchendon State Forest, the town includes the villages of Waterville and Winchendon Springs....

, reaching the Millers River approximately two miles west of the town center.