Lake Lanoto'o
Lake Lanoto'o is a volcanic crater lake on the island of Upolu in Samoa. It is the largest lake in Samoa. The lake is surrounded by Lake Lanoto'o National Park and is designated as a wetland of international importance under the Ramsar Convention. The lake is  long with a maximum depth of  and an area of 11 hectares, with a water temperature of  and a pH of 5.72. The crater is between 100,000 and 1 million years old. Sediment cores from the lake have been used to date the human settlement of Upolu and of Polynesia, and to study the paleoclimate and past ecology of Upolu. The lake provides an important habitat for the Pacific black duck and Spotless crake. Goldfish were introduced during the German colonial period. References

Tuamasaga
Volcanoes of Samoa
Bodies of water of Samoa
Ramsar sites in Samoa
Lanoto'o