Located at the northern end of Great Diamond Island, our 43 slip deep-water marina can accommodate vessels up to 110+ ft. Our private marina is available exclusively for guests at Diamond's Edge Restaurant, the Inn at the Diamond Cove, and all overnight boaters.
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.
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.
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.
Great marina, friendly dockmaster. Great dining nearby and nice trails for walking.
Great stay and Chris the Dock Master was outstanding. Very accommodating and very customer focused.
Chris and John are excellent at their craft. Very helpful. Really enjoyed the comings and goings of the ferry.
Diamond’s Edge Marina was amazing! Dockwa calculating the wrong dockage fee was our only issue.
The dock manager was very helpful and friendly. They are a little short handed, but everything seemed to get done and I got all the help I needed.
The dock master was rude and offensive. He asked us to tip the dock hand which we already had done. He then came to our table to confirmation our reservation which we did online. He again asked us to tip the dock hand. When we returned to our boat, he asked us again about tipping the dock hand. He was pleasant enough, but was extremely rude and intrusive by constantly chasing us down for the fee for stopping at the dock and tipping the dock hand. Unfortunately, I will not return there because of him. I guess the $250 lunch isn’t good enough.