The Ōrongorongo River flows from the Rimutaka Ranges to the southern coastline near Wainuiomata.
The Ōrongorongo River is a significant river near Wainuiomata, originating in the Rimutaka Ranges and flowing southward to meet the coast near Turakirae Head. Known for its unspoiled natural beauty, the river is surrounded by dense native bush and rugged terrain, making it a favourite destination for outdoor enthusiasts.
The Ōrongorongo Valley, which the river runs through, is part of the Remutaka Forest Park and offers opportunities for tramping, fishing, and camping. The river eventually empties into the south coast near Wainuiomata.
Both the Ōrongorongo River and the Wainuiomata River are vital sources of drinking water for the Wellington region, supplying water through the Wainuiomata-Orongorongo Water Collection Area.