Coecles Harbor is located on Shelter Island and is a hidden cruising gem in eastern Long Island, since it is difficult to find and the entrance is extremely narrow, but if you are looking for a secluded harbor to relax then this is a must location. The entrance is located on the eastern side of Shelter Island in Gardiners Bay and while the entrance is extremely narrow, it is relatively short. I was on a 40-foot sailboat going through the narrow channel and a man was fishing about 8-feet from the boat in hip-high water. I was unsure if we had enough water, but the captain ensured me there was enough water as he had been there several times.