It is a popular spot for whitewater kayaking and trout fishing .
The Arnold River flows northwest for 20 kilometres ( 12 mi ) , joining the Grey immediately above the town of Brunner , some 15 kilometres ( 9 mi ) from the Tasman Sea .
Arnold River is a popular spot for whitewater kayaking and trout fishing .
The Arnold River flows northwest for 20 kilometres ( 12 mi ) , joining the Grey immediately above the town of Brunner , some 15 kilometres ( 9 mi ) from the Tasman Sea .