Great Southern Highway is a highway in the Southern
Wheatbelt region of
Western Australia, starting from
Great Eastern Highway at
The Lakes, 50 km from
Perth, and ending at
Albany Highway near
Cranbrook. It is the primary thoroughfare for this part of Western Australia and runs parallel with the Perth-Albany railway for its entire length. It is signed as State Route 120 from York to Cranbrook, and was first named in 1949, although it was built well before that time.