The Riwaka River is located in the Nelson region in the northwest of New Zealand's South Island. It flows for 20 kilometres, entering Tasman Bay close to the town of Riwaka, 10 kilometres north of Motueka.
For part of its journey, the river flows underground through limestone caves, returning to the open air at The Riwaka 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.
- "Place Name Detail Riwaka River". New Zealand Geographic Placenames Database. 2008-10-31. Retrieved 2010-07-25.
- Basher, L.R. "The Motueka and Riwaka Catchments". Land Research New Zealand. Retrieved 5 September 2012.
- "The Riwaka Resurgence". Motueka Online. Retrieved 5 September 2012.
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