Portland is located just five miles south of the resort of Weymouth, forming the southernmost point of the county of Dorset, United Kingdom. Portland’s harbor is one of the deepest man-made harbors in the world at 39 to 66 feet. The large, deep artificial harbor was a Royal Navy base during World War I and World War II; the Navy and NATO trained in its waters until the 1990s. It was the host to the sailing events for the 2012 Olympic Games.