Keywords: folly island follyisland maine usgs coastal landscape ocean research science water outdoor sky shore coast Folly Island, a preserve owned by the Maine Coast Heritage Trust, is about 7 acres in size. It is located in Bartlett Narrows, along the western coast of Mount Desert Island. Bar Harbor, ME, USA. Photo Credit: Alex Demas, USGS Folly Island, a preserve owned by the Maine Coast Heritage Trust, is about 7 acres in size. It is located in Bartlett Narrows, along the western coast of Mount Desert Island. Bar Harbor, ME, USA. Photo Credit: Alex Demas, USGS |