 Denges and Eil Malk Passages are passable, but navigation may be difficult in the lagoon between them and Ulong Island.From Ulong to Malakal Harbor, the lagoon is navigable.Henry Wilson (1740–1810), an English naval captain of the British East India Company was aboard his packet ship "Antelope", when it shipwrecked off Ulong Island in 1783; he returned to England with the local Prince Lee Boo.