The Ela River is a 10.6 mile long (17.1 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...

 located in eastern 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 Cocheco River

Cochecho River

The Cochecho River or Cocheco River is a tributary of the Piscataqua River, 38.3 miles long, in the U.S. state of New Hampshire. It rises in northern Strafford County and runs southeastward, through the town of Farmington and the cities of Rochester and Dover, where it provides hydroelectric power...

, part of the Piscataqua River

Piscataqua River

The Piscataqua River, in the northeastern United States, is a long tidal estuary formed by the confluence of the Salmon Falls and Cocheco rivers...

 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...

 leading to the Atlantic Ocean

Atlantic Ocean

The Atlantic Ocean is the second-largest of the world's oceanic divisions. With a total area of about , it covers approximately 20% of the Earth's surface and about 26% of its water surface area...

.

The river begins at Coldrain Pond in New Durham, New Hampshire

New Durham, New Hampshire

New Durham is a town in Strafford County, New Hampshire, United States. The population was 2,638 at the 2010 census. It is drained by the Merrymeeting and Ela rivers, and is known for Merrymeeting Lake. New Durham is home to the Powder Mill Fish Hatchery...

, four miles east of Lake Winnipesaukee

Lake Winnipesaukee

Lake Winnipesaukee is the largest lake in the U.S. state of New Hampshire. It is approximately long and from wide , covering — when Paugus Bay is included—with a maximum depth of ....

. Flowing south through Club Pond, the river turns southeast and descends to Farmington

Farmington, New Hampshire

Farmington is a town located in Strafford County, New Hampshire, USA. The 2010 census reported that the town had a total population of 6,786. Farmington is home to Blue Job State Forest....

, where it joins the Cocheco. New Hampshire Route 11

New Hampshire Route 11

New Hampshire Route 11 is a long east–west state highway in New Hampshire, running westward along the southern shore of Lake Winnipesaukee. Its eastern terminus is at the Maine state line in the city of Rochester, where it continues north as Maine State Route 11. U.S. Route 202, which runs...

parallels the river for most of its southeasterly course.