Lake Chaubunagungamaug, also known as Webster Lake, is a lake in the town of Webster, Massachusetts, United States. It is located near the Connecticut border and has a surface area of 1,442 acres (5.84 km2). Since 1921, the lake has also been known by a much longer name having 45 letters: Lake Char­gogg­a­gogg­man­chaugg­a­gogg­chau­bun­a­gung­a­maugg.