South Western Highway

South Western Highway Western Australia
View north of Harvey
General information
Type	Highway
Length	406 km (252 mi)
Route number(s)	National Route 1 (Bunbury – Walpole) State Route 20 (Armadale – Bunbury) State Route 22 (Mundijong) State Route 107 (Roelands – Bunbury)
Major junctions
Northwest end	Albany Highway (State Route 30), Armadale, Perth
	Thomas Road (State Route 21) Pinjarra Road Coalfields Highway (State Route 107) Robertson Drive (National Route 1 / State Route 10) Brockman Highway Muirs Highway (State Route 102) Vasse Highway
Southeast end	South Coast Highway (National Route 1), Walpole
Location(s)
Major settlements	Serpentine, North Dandalup, Pinjarra, Waroona, Yarloop, Harvey, Brunswick Junction, Bunbury, Donnybrook, Bridgetown, Manjimup
Highway system
Highways in Australia National Highway • Freeways in Australia Highways in Western Australia
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South Western Highway is a highway in the South West region of Western Australia connecting Perth's southeast with Walpole. It is a part of the Highway 1 network for most of its length.^[1] It is about 406 kilometres (252 mi) long.