kohaihai river at the start of the heaphy track, kahurangi national park, west coast, new zealand

river stream sunny day heaphy track kahurangi national park aotearoa zealand south island great walk walking outdoors scenic trek hiking hike forest landscape tramping trekking backcountry trees travel nature kiwi trail explore adventure native bush dept conservation region doc karamea west coast mountain bike mtb tannin brown surge swell kahaihai tidal kohaihai start