Muskeget Island is a low sandy island to the west of Tuckernuck Island and Nantucket, in the town of Nantucket, Massachusetts.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 292 acres (1.18 km2).The Muskeget Island group contains Dry Shoal, Skiff Island, Tombolo Point, and Adams Island. Much of Muskeget is owned by the town of Nantucket.
Muskeget is the southernmost breeding place of Grey Seals. Muskeget Island and Monomoy Island are the primary seal colonies off the New England
coast. In 2008, more than 2,000 pups were born on Muskeget. With this large seal population, the waters surrounding Muskeget are an important feeding area for Great white sharks.The island is also home to an indigenous species of rodent known as the Muskeget Vole.
Muskeget is inaccessible to most boats because of shoals and sandbars. Kayaking there can be very dangerous because of rip currents, swells, whirlpools, and lobster pots. Specialized boats designed to navigate the difficult waters around the Island depart from Nantucket Harbor.