Andy Trowbridge / Limestone Arch on the Oparara River known as 'Moria Gate'. The Oparara river system has been sculpting the limestone into an intriguing complex of caves, arches and channels for millions of years Opa...

Rob Brown / Moria Gate Arch, Oparara Valley, Kahurangi National Park, New Zealand

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