Yan Yean Reservoir

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Yan Yean Reservoir
Coordinates	37°33′S 145°08′ECoordinates: 37°33′S 145°08′E
Lake type	reservoir
Primary inflows	Plenty River
Primary outflows	Plenty River
Basin countries	Australia
Water volume	29 mio m³

Yan Yean Reservoir is the oldest water supply for the city of Melbourne, Australia. It is built on the Plenty River a tributary of the Yarra River, 30 km north of the city. A 9.5 metre embankment holds back 29 million cubic metres of water. At the time of its construction in 1870 it was the largest artificial reservoir in the world.^{[citation needed]}

It was designed by James Blackburn, a former London sanitary inspector and, later, a transported convict.