Martha’s Vineyard is an island (including the smaller Chappaquiddick Island) located south of Cape Cod in Massachusetts, known for being an affluent summer colony. Often called just “The Vineyard,” the island has a land area of 100 square miles . It is the 58th largest island in the United States and the third largest on the East Coast of the United States. It is also the largest island not connected to mainland by a bridge or tunnel on the East Coast of the United States.