The Southernmost Point Buoy is an anchored concrete buoy in Key West, Florida that claims to mark the southernmost point in the continental United States — though it is neither the true southernmost point of the continental US nor of Key West — and was established as a tourist attraction by the city on September 10, 1983. The large painted buoy …The Southernmost Point Buoy is an anchored concrete buoy in Key West, Florida that claims to mark the southernmost point in the continental United States — though it is neither the true southernmost point of the continental US nor of Key West — and was established as a tourist attraction by the city on September 10, 1983. The large painted buoy is 18 feet above sea level at the corner of South Street and Whitehead Street.