Pleasant Lake is a 479 acres (1.9 km²) lake located in Rockingham County

Rockingham County, New Hampshire

-Demographics:As of the census of 2000, there were 277,359 people, 104,529 households, and 74,320 families residing in the county. The population density was 399 people per square mile . There were 113,023 housing units at an average density of 163 per square mile...

 in 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...

, United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

, in the town of Deerfield

Deerfield, New Hampshire

Deerfield is a town in Rockingham County, New Hampshire, United States. The population was 4,280 at the 2010 census. Deerfield is home to the annual Deerfield Fair.- History :...

. The eastern shore of the lake forms the boundary between Deerfield and the town of Northwood

Northwood, New Hampshire

Northwood is a town in Rockingham County, New Hampshire, United States. The population was 4,241 at the 2010 census.-History:First settled in 1763, Northwood was incorporated on February 6, 1773 by Colonial Governor John Wentworth, when a large tract of land called "North Woods" was separated from...

. Water from Pleasant Lake flows north to Northwood Lake

Northwood Lake

Northwood Lake is a water body located in Rockingham and Merrimack counties in central New Hampshire, United States, in the towns of Northwood and Epsom...

, then west via the Little Suncook River

Little Suncook River

The Little Suncook River is a river located in central New Hampshire in the United States. It is a tributary of the Suncook River, part of the Merrimack River watershed....

 to the Suncook River

Suncook River

The Suncook River is a river located in central New Hampshire in the United States. It is a tributary of the Merrimack River, which flows to the Gulf of Maine....

, a tributary 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...

. It is one of the top 10 cleanest lakes in 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...

.