Glenroy River

The Glenroy River is the main tributary of the Mātakitaki River in the north of New Zealand's South Island.. It rises in the Spenser Mountains before flowing north for roughly 40 km (25 mi) to its confluence with the Mātakitaki River. Despite its remote location, the river and its surrounding valley are used for a variety of recreational uses, including hunting and fishing. The river itself is regarded as a short class IV river for rafting, due to rapids along the river's length.

Source: Wikipedia https://en.wikipedia.org/wiki/Glenroy_River