This is a low resolution image for the web. The print you'll get has sharp detail. The Sanibel Island Lighthouse peeking through the tropical greenery. The Sanibel Island Light is the first lighthouse on Florida's Gulf coast north of Key West and the Dry Tortugas. It is located on the eastern tip of Sanibel Island, and was built to mark the entrance to San Carlos Bay for ships calling at the port of Punta Rassa, across San Carlos Bay from Sanibel Island. Photography by Minerva Bloom.