Lake Chaubunagungamaug, also known as Webster Lake, is a lake in the town of Webster, Massachusetts. It is located near the Connecticut border and has a surface area of 5.836 km² with a 27 km shoreline. Since 1921, the lake has also been known by a much longer name having 45 letters comprising fourteen syllables: Lake Chargoggagoggmanchauggagoggchaubunagungamaugg. The lake has become famous beyond Central Massachusetts for having the longest name of any geographic feature in all of the United States.
It is the fourth largest fresh body of water in Massachusetts, after slightly larger Long Pond, The Wachusett Reservoir in Clinton, and the much larger Quabbin Reservoir. The average depth is 4 m and the maximum depth is 15 m.
Although the lake is natural in origin, its outlet has a dam that raises the water level by roughly 0.61 m. The dam initially provided water for a mill, and subsequently the water rights to the lake were owned by Cranston Print Works; currently, the dam is owned by Webster Lake Preservation LLC.
The lake is commonly divided into three smaller bodies of water: North Pond, Middle Pond, and South Pond. They are connected by narrow channels.
