The HBF 3 Waters Marathon in Bunbury, Western Australia on Sunday, 7 April 2019 is the 38th consecutive Bunbury Marathon.
The course is designed to showcase Bunbury's natural assets and is called the 3 Waters Running Festival because it takes in the Leschenault Inlet, Koombana Bay and the Indian Ocean. For good measure, it also includes the Bunbury Big Swamp, a conservation wetland and wildlife sanctuary, located one kilometre south of the Bunbury city centre.
Runners in the marathon, ultra-marathon, half marathon run and walk will each receive a commemorative medal. There are significant cash prizes for category winners.