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.

Yanchep is an outer coastal suburb of Perth, Western Australia, 56 kilometres (35 mi) north of the Perth CBD. It is a part of the City of Wanneroo local government area. Originally a small crayfishing settlement, it was developed by entrepreneur Alan Bond in the 1970s for the 1977 America's Cup. The area covers the urban centre of Yanchep as well as Yanchep National Park in its entirety.