Lake Wentworth is located in Carroll County in eastern New Hampshire, United States, in the town of Wolfeboro. At , it is the seventh-largest lake located entirely in New Hampshire. Water from Lake Wentworth flows through the short Smith River into Crescent Lake and then over the dam into Lake Winnipesaukee in Wolfeboro. The Wentworth State Park offers public access to the lake. Geography and water quality The Wentworth-Crescent watershed is a sub-watershed of the Lake Winnipesaukee watershed and the greater Merrimack River watershed. The three major water bodies, Sargents Pond, Crescent Lake, and Lake Wentworth, and 11 year-round tributaries are included in the sub-watershed, containing over of surface water, of wetlands, and over of shoreline. The Wentworth Watershed Association works to protect the land and surface waters of this sub-watershed. Lake Wentworth is part of the UNH Extension Lakes Lay Monitoring Program, a volunteer water sampling program. Water quality data has been collected since 1984. Lake Wentworth is considered oligotrophic, with excellent water quality, except at its deepest points where it is considered mesotrophic, in fair condition due to low dissolved oxygen levels. The lake is classified as a warmwater fishery, with observed species including rainbow trout, smallmouth and largemouth bass, chain pickerel, horned pout, and white perch. Islands There are at least 18 named islands in the lake: Stamp Act Island (the largest at ), Bass Island, Cate Island, Mink Island, Goose Island, East and West Jockey Cap Islands, Triggs Island, Turtle Island, Fanny Island, Brummet Island, and a group known as the Seven Sisters Islands: Sister Island, Poplar Island, Loon Island, Flo Island, Wal Island, Min Island, and Joe Island. There are numerous additional ledges, rocks, and islets in the lake. Bass Island The seventh largest of the islands, its name comes from the most dominant fish in the lake. Its original name was Goss Island, named after its original owner, Walter Goss. There is now one house on the island. The island is connected to Stamp Act Island through an underwater reef. Brummitt Island One of the smallest islands ever to be inhabited, but now the island does not have any house on it. The island was originally inhabited by Henry D. Brewster, and was originally called Townsend's Islands, named after the shore to which it is the closest. Cate Island Named after the Cate family, who owned a piece of Stamp Act Island. The island