The Boonwurrung, also spelt Bunurong or Bun wurrung, are an Aboriginal people of the Kulin nation, who are the traditional owners of the land from the Werribee River to Wilsons Promontory in the Australian state of Victoria. Their territory includes part of what is now the city and suburbs of Melbourne. They were called the Western Port or Port Philip tribe by the early settlers, and were in alliance with other tribes in the Kulin nation, having particularly strong ties to the Wurundjeri people.

The Werribee River is a perennial river of the Port Phillip catchment that is located on the expansive lowland plain southwest of Melbourne, Victoria, Australia. The headwaters of a tributary, the Lerderderg River, are north of Ballan near Daylesford and it flows across the basalt plain, through the suburb of Werribee to enter Port Phillip. A linear park follows the Werribee River along much of its course. In total the Werribee River completes a journey of approximately 110 kilometres (68 mi).