Oparara River near Moria Gate Mirror Tarn
|Basin countries||New Zealand|
|Length||25 kilometres (16 mi)|
|Mouth elevation||0 metres (0 ft)|
The river and most of its tributaries originate in the Fenian Ranges in the Kahurangi National Park, where the river flows through a section of the Honeycomb Hill Cave. Further downstream it continues through the Oparara Arch and the Moria Gate Arch, both of which are popular walking destinations. These sections of the Oparara River, while still in dense native forest, can be reached by a forestry road. For the majority of its length it continues to meander south through the Oparara Basin before turning west to flow into the Tasman Sea near the small settlement of Oparara north of the township of Karamea.
The river's color varies from tea-like shades of golden brown to red from the natural organic tannins released into the water by several of the plant species in the area. Leaves and other plant matter on the forest floor releases these tannins as they decompose - this eventually leeches into and stains the water, with the shade and intensity varying depending on rainfall and season.
The river and contributing streams in the area are a habitat for the endangered South Island whio; the area used to sustain a large population of whio and is now a location for a recovery programme run by the New Zealand Department of Conservation. The rare and protected Oparara Giant land snail (Powelliphanta annectens) has only been found in areas around 700m from the Oparara River.
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