Lord Howe Island, volcanic island (1991 pop. 371), 5 sq mi (12.9 sq km), S Pacific, a dependency of New South Wales, Australia. It is a resort c.300 mi (480 km) E of the Australian coast. The island has unique flora and fauna as well as the southermost coral reefs. The island was explored in 1788 by the British and was settled in 1834.