In outback Australia, how long is the so called "Gunbarrel Highway"?

The route is a long and tough haul through very remote territory. Its isolation requires travellers to be totally self-sufficient with water, food and fuel. The longest distance between fuel outlets is 489 km (304 mi), between Warburton and Carnegie Station. Part of the road between Jackie Junction and Warakurna, near Giles, is now known as the Old Gunbarrel Highway, and is no longer maintained due to the construction of the more direct route, the Great Central Road.

The route passes directly into Aboriginal land. It is a legal requirement for travellers to hold a valid transit permit at the time of travel. Three free permits are required in Western Australia and a permit is required to enter the APY Lands in South Australia.