- a river in SE Australia, in New South Wales, flowing NW to the Darling River. 750 miles (1210 km) long.
- Lachlan. 1762–1824, Australian colonial administrator; Governor of New South Wales (1809–21), noted for his reformist policies towards ex-convicts and for his record in public works such as road-building in the colony
- an Australian island in the Pacific, SE of Tasmania: noted for its species of albatross and penguin. Area: about 168 sq km (65 sq miles)
- a river in SE Australia, in E central New South Wales, rising in the Blue Mountains and flowing NW to the Darling. Length: about 1200 km (750 miles)