Corunna Downs Airfield was a secret Royal Australian Air Force (RAAF) base at Corunna Downs, 40 km (25 mi) south of Marble Bar, Western Australia in the Pilbara Region during World War II. The airfield, created especially for heavy bombers, comprised two intersecting bitumen runways, a north–south (107°) runway 5,000 ft × 150 ft (1,524 m × 46 m) and an east–west (165°) runway 7,000 ft × 150 ft (2,134 m × 46 m). No. 73 Operational Base Unit was responsible for operating the airfield during World War II. The base has been abandoned since World War II.