• Length: 63 Miles
• Surface Area: 5,543 Acres
• Volume: 127,371 Acre Feet
• Drainage Area: 33 Square Miles
• Average Depth: 37 Feet
• Maximum Depth: 100 feet
Cobbosseecontee Lake, also known as Cobbossee Lake, is a lake located in the towns of Litchfield, Manchester, Monmouth, West Gardiner, and Winthrop Maine. It is the largest lake in the Winthrop Lakes Region at 100 feet deep, covering about 8.7 square miles in surface area, a length of 9 miles, and a shoreline of 62 miles.
Cobbossee Lake is known for its coves, inlets, and over two dozen islands. It also has the only active inland waters lighthouse in Maine, Ladies Delight Light. The 25-foot high lighthouse, constructed in 1908, is under the ownership and care of the Cobbosseecontee Yacht Club. Founded in 1904, the club is one of the oldest continually operating inland yacht clubs in the United States. The lighthouse marks the northern edge of a jagged underwater reef that runs down the middle of the lake. The archipelago of islands and exposed ledges are the visible high points of that reef. A state-owned public launch is located on the southwest shore of the lake in East Monmouth. Low hills and ridges surround the lake, and Monks Hill and Allen Hill rise a few miles north of the lake, while a gray line of hills form a barrier near Sabattus. There are many year-round homes and cottages along the shoreline, but there is much less development on the islands in the middle of North Bay. Just south of Belle Island sits a 50-yard long ledge.