The Red Hill River is a 6.5 miles (10.5 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 the Lakes Region

Lakes Region (New Hampshire)

The Lakes Region of New Hampshire is the mid-state region surrounding Lake Winnipesaukee, Winnisquam Lake, Squam Lake, and Newfound Lake.The area is a popular tourist destination in the summer time, with the activity peaking during the annual Motorcycle Week and races at Loudon's New Hampshire...

 of central 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 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 ....

, part of the Merrimack River

Merrimack River

The Merrimack River is a river in the northeastern United States. It rises at the confluence of the Pemigewasset and Winnipesaukee rivers in Franklin, New Hampshire, flows southward into Massachusetts, and then flows northeast until it empties into the Atlantic Ocean at Newburyport...

 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...

.

The Red Hill River begins in the town of Sandwich, New Hampshire

Sandwich, New Hampshire

Sandwich is a town in Carroll County, New Hampshire, United States. The population was 1,326 at the 2010 census. Sandwich includes the villages of Center Sandwich and North Sandwich...

 at the outlet of Red Hill Pond, just east of the village of Center Sandwich

Center Sandwich, New Hampshire

Center Sandwich is a census-designated place in the town of Sandwich in Carroll County, New Hampshire. It is the primary settlement in the town and had a population of 123 at the 2010 census....

. The river flows generally south, through a series of wetlands, into Moultonborough

Moultonborough, New Hampshire

Moultonborough is a town in Carroll County, New Hampshire, United States. The population was 4,044 at the 2010 census. Moultonborough is bounded in part by Lake Winnipesaukee in the southwest and Squam Lake in the northwest corner...

. The river passes through Garland Pond, drops in a short river segment to Lees Pond, and ends at an arm of Moultonborough Bay on Lake Winnipesaukee.