NABSQNO 19T-556530-4920275Mount Desert Island Arch, Hancock County, Maine Photo by Bill Gorman NABSQNO 19T-556530-4920275. Mount Desert Island Arch is a double sea natural arch eroded through Ellsworth schist by wave action. It is located on Mount Desert Island, west of Salsbury Cove, Hancock County, Maine. Access is at low tide and is usually by kayak. The larger opening has a span of about 8 feet.
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