The Yarra River is a river in East-Central Victoria, Australia that flows through the city of Melbourne. This article contains explanations and lists of the river's tributaries and other geographic features. The river flows atop layers of silt that built up within an ancient river valley around 10,000-15,000 years ago. The Yarra River has two other names ‘the upside down river’ and ‘Birrarung’. The Yarra was for say nicknamed the upside down river because of the way some of it looked. Birrarung was the very first name that the indigenous Australians gave it.