The Eyre Highway is a highway linking Western Australia and South Australia via the Nullarbor Plain. Signed as National Highway 1/A1, it forms part of Highway 1 and the Australian National Highway network linking Perth and Adelaide. It was named after explorer Edward John Eyre, who was the first to cross the Nullarbor by land in 1840–1841. The Eyre Highway runs from Norseman in Western Australia, past Eucla, to the state border.