Coecles Harbor Marina & Boatyard is the premier full-service marina located on Shelter Island, one of the most unspoiled destinations on Long Island’s East End. Since 1973, Coecles Harbor Marina has maintained the highest reputation for its outstanding marina facilities, repair services, restoration work and comprehensive seasonal maintenance.  Coecles Harbor provides a stunning, protective setting for the Marina’s seasonal and transient slips and moorings. It’s no wonder that our boaters return year after year to enjoy the Marina’s first class facilities.