Riverton, officially Riverton / Aparima, is a small New Zealand town 30 kilometres west of Invercargill, on the south-eastern shorelines of th…Riverton, officially Riverton / Aparima, is a small New Zealand town 30 kilometres west of Invercargill, on the south-eastern shorelines of the Jacobs River Estuary. The estuary is formed by the Aparima and Pourakino rivers, leading through a narrow outflow channel into Foveaux Strait. Accessible via State Highway 99 on the Southern Scenic Route, the main part of the town is on flat land and the northern end of Oreti Beach. South Riverton is built on the hills between the eastern shore of the estuary and Taramea Bay.