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The marina will be open as of May 31, 2020.  For further Boat slip rental information please call (207) 775 9090

Located at the northern end of Great Diamond Island, our full-service marina can accommodate large sailboats and motor boats. The Marina is available exclusively for guests at Diamond's Edge Restaurant and the Inn at the Diamond Cove; all other boaters need to reserve an overnight slip in advance to dock on the island.

Visit the island to explore and take in 193 acres of spectacular natural landscape that inspires outdoor recreation and relaxation. The island is home to Diamond Cove, a small residential community that was a former military base built during America's Gilded age, the luxurious Inn at Diamond Cove, the highly-rated Diamond Edge Restaurant, and the Fort McKinley Museum.

Casco Bay Ferry Schedule

Reservations required for overnight dockage
(207) 766-5694


  • Monitoring VHF Channel 9
    Approach 20-foot depth with 12-foot depth at the dock
  • Water & Electrical (110/220 and 30/50 amp. service)
  • Dinghy Dockage
  • Restrooms, Showers & Ice
  • Ferry Service through Casco Bay Line