The Plenty River is a perennial river of the Port Phillip catchment, located in the north-eastern Greater Melbourne region of the Australian state of Victoria. Course and features The Plenty River rises in the forested slopes of Mount Disappointment, northwest of . The river flows generally south, joined by three minor tributaries, before reaching its confluence with the Yarra River southeast of . The river descends over its course. The river is impounded by the Toorourrong Reservoir and is the source of Melbourne's first major water supply reservoir, the Yan Yean Reservoir, completed in 1857. Along the lower reaches of the river, both the Plenty River Trail and the Rosanna Golf Club can be located. See also Plenty, Victoria Lower Plenty, Victoria References Melbourne Water catchment Rivers of Greater Melbourne (region) Tributaries of the Yarra River Shire of Nillumbik City of Whittlesea City of Banyule