Mundaring Weir
The 928th tallest dam in the world
Mundaring Weir is a concrete gravity dam (and historically the adjoining locality) located 39 kilometres (24 mi) from Perth, Western Australia in the Darling Scarp. The dam and reservoir form the boundary between the suburbs of Reservoir and Sawyers Valley. The dam impounds the Helena River.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).