The most recent edition of this event was on 9 April 2017.
The 3 Waters Marathon Bunbury, Western Australia has a 50km Ultramarathon, 42km Marathon, 21km Half Marathon, 10km and 5km running/walking events.
The event is organised by the Bunbury Runners Club and the course is designed to showcase Bunbury's natural assets. It is called the 3 Waters Marathon taking in the Leschenault Inlet, Koombana Bay and the Indian Ocean.
For good measure, the event includes the Bunbury Big Swamp a conservation wetland and wildlife sanctuary, located one kilometre south of the Bunbury city centre.