The North Branch of the Upper Ammonoosuc River is an 11.0 mile long (17.8 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...

.

Nearly the entire length of the North Branch is in the town of Milan, New Hampshire

Milan, New Hampshire

Milan is a town in Coos County, New Hampshire, United States. The population was 1,337 at the 2010 census. It is part of the Berlin, NH–VT Micropolitan Statistical Area....

. The river briefly enters the city of Berlin

Berlin, New Hampshire

Berlin is a city along the Androscoggin River in Coos County in northern New Hampshire, United States. The population was 10,051 at the 2010 census. It includes the village of Cascade. Located on the edge of the White Mountains, the city's boundaries extend into the White Mountain National Forest...

, where it passes through Head Pond, then heads north back into Milan, running parallel to the Upper Ammonoosuc until the two rivers join in the village of West Milan. The Androscoggin River

Androscoggin River

The Androscoggin River is a river in the U.S. states of Maine and New Hampshire, in northern New England. It is long and joins the Kennebec River at Merrymeeting Bay in Maine before its water empties into the Gulf of Maine on the Atlantic Ocean. Its drainage basin is in area...

, just three miles to the east, flows parallel to the two Upper Ammonoosuc branches, but in the opposite direction. The St. Lawrence and Atlantic Railroad

St. Lawrence and Atlantic Railroad

The St. Lawrence and Atlantic Railroad , known as St-Laurent et Atlantique Quebec in Canada, is a short line railroad operating between Portland, Maine on the Atlantic Ocean and Montreal, Quebec on the St. Lawrence River. It crosses the Canada-U.S...

follows the North Branch from Head Pond to West Milan.