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The supply of water to the waterfall is from Lake Letas. This lake is a large freshwater lake located in the crater at the centre of the volcanic island, about 600 meters above sea level. Water flows from the lake 3 km east to the top of Siri Waterfall. After the waterfall, the water flows as a large stream, called Mbe Solomul River (formerly Namang), for another 3 km before it reaches the sea. The large stream is known as "Big Water".
A rough estimate of the water flow rate (during the dry season month of August 2006) was approximately 5 cubic metres per second.
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