Muskeget Island is part of the terminal moraine marking the maximum extent of the last glacial ice sheet to reach the northeastern coast. It has an area of ; a saltwater lagoon covers of this area. The Muskeget Island group contains Dry Shoal, Skiff Island, Tombolo Point, and Adams Island. Two-thirds of the island is owned by former reporter Crocker Snow Jr., with the rest owned by the town of Nantucket. There are currently two unoccupied shacks on the island, both of which are remnants of old structures, and a small landing strip.
