The Swift Diamond River is a 17.8 mile long (28.7 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 Dead Diamond River

Dead Diamond River

The Dead Diamond River is an 18.7 mile long river in northern New Hampshire in the United States. Its water enters the Atlantic Ocean on the coast of Maine by passing through the Magalloway, Androscoggin, and Kennebec rivers....

, located in 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...

 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...

 of Maine

Maine

Maine is a state in the New England region of the northeastern United States, bordered by the Atlantic Ocean to the east and south, New Hampshire to the west, and the Canadian provinces of Quebec to the northwest and New Brunswick to the northeast. Maine is both the northernmost and easternmost...

 and New Hampshire.

The Swift Diamond River rises in the town of Stewartstown, New Hampshire

Stewartstown, New Hampshire

Stewartstown is a town in Coos County, New Hampshire, United States. The population was 1,004 at the 2010 census. It includes the village of West Stewartstown and is part of the Berlin, NH–VT Micropolitan Statistical Area.-History:...

, at the outlet of Diamond Pond within Coleman State Park. The river flows southeast and then east through mountainous and heavily forested terrain, where the chief land use is logging

Logging

Logging is the cutting, skidding, on-site processing, and loading of trees or logs onto trucks.In forestry, the term logging is sometimes used in a narrow sense concerning the logistics of moving wood from the stump to somewhere outside the forest, usually a sawmill or a lumber yard...

. The river passes through the townships of Dixville

Dixville, New Hampshire

Dixville 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 .The population was 12 at the 2010 census...

 and Dix's Grant

Dix's Grant, New Hampshire

Dix's Grant is a township located in Coos County, New Hampshire, United States. As of the 2010 census, the grant had a total population of 1. In New Hampshire, locations, grants, townships , and purchases are unincorporated portions of a county which are not part of any town and have limited...

 before joining the Dead Diamond River in the Dartmouth College Grant

Second College Grant, New Hampshire

Second College Grant is a township located in Coos County, New Hampshire, United States. The area of this township is owned and controlled by Dartmouth College. As of the 2010 census, the grant had a total population of 0....

.