The Riuwaka River, formerly known as the Riwaka River, is located in the Nelson region in the northwest of New Zealand's South Island.[1][2] It flows for 20 kilometres, entering Tasman Bay close to the town of Riwaka, 10 kilometres north of Motueka.
The valleys of the Riuwaka and nearby Tākaka River form part of the pass over which the only road between Tasman Bay and Golden Bay runs.
For part of its journey, the river flows underground through limestonecaves, returning to the open air at The Riuwaka Resurgence. This spot is popular with both holidaymakers and divers, as the water is always crystal clear, and is very cold even in the heat of mid-summer.[3]
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