Blue Hill Bay Light is located on the small island of Green Island in Blue Hill Bay, 3.7 miles southeast of Brooklin. The station has also been called Sand Island Light, and Eggemogin Light, because it is located at the eastern entrance of Eggemogin Reach. This lighthouse is a well-kept secret today, but in the 19th Century, the light guided many a ship into the busy lumber port of Ellsworth.