Wikipedia EN Waitangitaona River
The Waitangitāhuna River (formerly called the Waitangitaona River) are two rivers in the West Coast region of New Zealand's South Island. It was a single river until an avulsion in March 1967, when it became two rivers. Since then, the southern portion of the river has flowed into Lake Wahapo, while the northern section discharges into the Tasman Sea north of Ōkārito Lagoon.
Source: Wikipedia https://en.wikipedia.org/wiki/Waitangit%C4%81huna_River