Lake Letas
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| Lake Letas | |
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| Location | Gaua |
| Lake type | crater lake |
| Basin countries | Vanuatu |
| Max. length | 9 km |
| Max. width | 6 km |
| Surface elevation | 600 m |
Lake Letas is the largest lake in Vanuatu, located in the crater of the volcanic island of Gaua in northern Vanuatu.
The lake is U-shaped, it is about 9 km long (north to south) and about 6 km wide. It is situated in the centre of the 20 km diameter island, and rests about 600 meters above sea level. It is a fresh water lake. The water in the lake is not very clear, but has a greenish colour. Water constantly flows out of the lake at a natural overflow located on the eastern side of the lake. The water flows about 3 km east to Siri Waterfall and then another 3 km before it reaches the sea.
Local people say there is a canoe at the top of the lake which is used to cross the lake from the eastern side to get to Mount Gharat. The canoe is sometimes located on the eastern edge of the lake (near the water overflow), or sometimes on the north-eastern edge of the lake (nearest Gaua Airport).
A rough estimate of the water flow rate out of the lake (during the dry season month of August 2006) was approximately 3 cubic metres per second.
