Lake Tiriara is a lake located on the southern end of the island of Mangaia, a part of the Cook Islands.

It is the largest freshwater lake in the island chain.

Poor pollution management and agricultural processes in the area have put the biodiversity of the lake at risk.

[1] Sources https://web.archive.org/web/20120128032425/http://www.seacology.org/projects/individualprojects/COOKISLANDS_lake2001.htm

This Cook Islands location article is a stub.