Two Rocks is an outer suburb at the northern edge of Perth, the state capital of Western Australia, located 61 kilometres (38 mi) northwest of the city's central business district. It is part of the City of Wanneroo local authority and represents the furthest northern extent of the Perth metropolitan region.

Marmion Avenue is a 40-kilometre (25 mi) arterial road in the northern coastal suburbs of Perth, Western Australia, linking Trigg in the south with Yanchep in the north. It forms part of State Route 71 along with West Coast Highway, which it joins onto at its southern terminus.