Lake Umbagog

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Lake Umbagog is a wilderness lake located in Coös County, New Hampshire and Oxford County, Maine. It is one of the most pristine lakes in the state of New Hampshire and lies near Errol, New Hampshire and the Thirteen Mile Woods Scenic Area along the border with Maine. The name Umbagog is pronounced by locals with the stress on the second syllable (um-BAY-gog) and is said to come from the Abenaki word for "shallow water".

The lake is part of a Federal Wildlife Refuge and a New Hampshire State Park. Along its southernmost shore, there is a public campground and a public boat launch ramp which may be accessed from New Hampshire Route 26. An interesting feature along its northwest shore is an expansive natural floating island composed of generations of decomposing marshland vegetation.

The lake runs almost 11 miles north to south and covers more than 7,500 acres, making it the largest lake along the Maine/New Hampshire border. Though it has an average depth of less than 15 feet, a deep section at the north end (aptly named "Deep Hole") may exceed 75 feet. The lake's area and depth were markedly increased with the construction of a dam at Errol in the 1800s.

Lake Umbagog is fed by the Magalloway River, the Rapid River, and the Dead Cambridge River. It is drained by the Androscoggin River.