Great Northern Highway links
Western Australia's capital city
Perth with its northernmost port,
Wyndham. With a length of almost , it is the longest highway in Australia, with the majority included as part of the Perth Darwin
National Highway. The highway is constructed as a
sealed, predominantly two-lane single carriageway, but with some single-lane bridges in the
Kimberley. Great Northern Highway travels through remote areas of the state, and is the only sealed road link between the
Northern Territory and northern Western Australia. Economically, it provides vital access through the
Wheatbelt and
Mid West to the resource-rich regions of the
Pilbara and Kimberley. In these areas, the key industries of mining, agriculture and pastoral
stations, and tourism are all dependent on the highway.