Yva Momatiuk & John Eastcott / Warning sign warning of presence of poison to hikers and pet owners, Karamea, South Island, New Zealand

Colin Monteath / Oparara River near Oparara Basin Arches, Kahurangi National Park, Karamea, New Zealand

Colin Monteath / Moria Gate Arch with limestone stalagtites on roof, swollen Oparara River, Kahurangi National Park, near Karamea, New Zealand

Colin Monteath / Nikau (Rhopalostylis sapida) palm fruiting body near Karamea, Kahurangi National Park, New Zealand

Colin Monteath / Stream stained brown by organic matter with overhanging ferns, Oparara Basin Arches, Kahurangi National Park, Karamea, New Zealand

Colin Monteath / Limestone boulders in Oparara River stained brown with organic matter, Oparara Basin Arches, Kahurangi National Park, near Karamea, New Zealand

Colin Monteath / Stream stained brown by organic matter with overhanging ferns, Oparara Basin Arches, Kahurangi National Park, Karamea, New Zealand

Colin Monteath / Moria Gate Arch with limestone stalagtites on roof and swollen Oparara River, near Karamea, Kahurangi National Park, New Zealand

Colin Monteath / Moria Gate Arch with limestone stalagtites on roof and tourist watching swollen Oparara River, Kahurangi National Park, near Karamea, New Zealand

Colin Monteath / Moria Gate Arch with limestone stalagtites on roof and tourist watching swollen Oparara River, Kahurangi National Park, near Karamea, New Zealand

Jim Harding / Fern frond showing spores, Karamea, South Island, New Zealand

Yva Momatiuk & John Eastcott / Nikau (Rhopalostylis sapida) forest, Karamea, South Island, New Zealand