Nash Stream is a 15.3 mile long (24.7 km) river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in northern 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 of the Upper Ammonoosuc River

Upper Ammonoosuc River

The Upper Ammonoosuc River is a tributary of the Connecticut River that flows through Coös County in northern part of the northeastern U.S. state of New Hampshire...

 and part 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...

 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...

.

Nash Stream rises on the western slopes of Whitcomb Mountain in the township of Odell, New Hampshire

Odell, New Hampshire

Odell is a township in Coos County, New Hampshire, United States. In New Hampshire, locations, grants, townships , and purchases are unincorporated portions of a county which are not part of any town and have limited self-government...

 and flows south-southwest through the town of Stratford

Stratford, New Hampshire

Stratford is a town located on the Connecticut River in Coos County, New Hampshire, United States. The population was 746 at the 2010 census. Within the town are the villages of North Stratford and Stratford Hollow. U.S...

 to join the Upper Ammonoosuc River in the town of Stark

Stark, New Hampshire

Stark is a town in Coos County, New Hampshire, United States. The population was 556 at the 2010 census. It has a famous covered bridge. The town includes the villages of Percy and Crystal as well as the village of Stark, located on the Upper Ammonoosuc River. New Hampshire Route 110 runs through...

. Near its headwaters, it passes through Nash Bog Pond, an extensive marshy area which used to be a large pond closed by a dam. The dam washed out in the 1960s. Nearly the entire stream is within the boundaries of the Nash Stream Forest, owned by the state of New Hampshire.

The Nash Stream 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...

 is surrounded by mountains. The most commonly hiked are North and South Percy Peaks, barren summits

Summit (topography)

In topography, a summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. Mathematically, a summit is a local maximum in elevation...

offering extensive views reached by a trail, and Sugarloaf, reached by a trail which formerly gave access to a fire tower.