Origin: Maori (Māori) Mythology, New Zealand
Orira was one of the eleven taniwha sons of Araiteuru (Āraiteuru) of Hokianga Harbour.  Each of her eleven sons took a journey to see the country in which they lived, and each left his own mark on the harbor or surrounding country side. 
Orira crossed through the lowlands to reach a mountain range he wished to see better. His burrowing created a tremendous commotion and attracted the attention of some locals. One of these locals, a giant, stopped him to see what the taniwha was doing.  Orira, displeased at being stopped as he made his way through the Umawera hills, responded rather tartly to the giant. 
The giant, enraged at the youngster's offense, clubbed Orira over the head, killing the taniwha instantly. A small trench remains to this day where Orira met his end.