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Dockage Reservations in Portland, Maine

Just 4 miles from Portland's Old Port, Diamond's Edge Restaurant and Marina offers boaters a unique Maine island experience. Located at the northern end of Great Diamond Island, our protected 43 slip deep-water marina can accommodate vessels up to 109+ ft.

All overnight guests have access to our complete resort amenities at the Inn at Diamond Cove including outdoor pool, tennis and basketball courts, bowling alley, access to Sea Glass beach, and more. We invite overnight guests to explore this secluded jewel and take in the island's 193 acres of spectacular natural landscape perfect for outdoor recreation and relaxing. With its spectacular sunsets, sheltered beaches, and acres of old-growth forest, this unique and historic location offers visitors an unparalleled opportunity to experience the tranquility of Maine island living. 

We invite boaters to dock and dine at our newly renovated Diamond's Edge Restaurant featuring fresh, local New England favorites. If arriving by boat to dine at the restaurant, please book online via Dockwa and make note of your reservation time during checkout. 

All slip reservations include complimentary water and Wi-Fi, and access to shower and bathroom facilities. Please hail us on VHF channel 09 as you enter the harbor and we'll happily guide you to your slip. All dockage reservations will be processed through Dockwa.

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