Lake Rotoiti, Nelson Lakes National Park

Lake Rotoiti, previously also known as Lake Arthur, is a lake in the Tasman Region of New Zealand. It is a substantial mountain lake within the borders of Nelson Lakes National Park. The lake is fed by the Travers River, water from the lake flows into the Buller River. The lake is surrounded by beech forest and is 82 metres deep. Saint Arnaud is a small community at the northern end of the lake. ()