The Tha Thung Na Dam is a multi-purpose hydroelectric dam in the Mueang Kanchanaburi District of Kanchanaburi Province, Thailand. It impounds the Khwae Yai River. The dam is located at the southeastern corner of Erawan National Park. It is a rock fill and concrete gravity dam, 840 m (2,760 ft) long and 30 m (98 ft) high. Its reservoir has a maximum storage capacity of 710,000,000 m3 (2.5×1010 cu ft). The dam's power plant has two hydroelectric generating units, each with an installed capacity of 19 MW. The first unit was commissioned in December 1981 and the second unit in February 1982.

Source: Wikipedia