Some 7km northwest of Thong Pha Phum town, this whopping 92m-high hydroelectric dam creates the Kheuan Khao Laem lake. There isn't much of a visitor experience and it's only accessible if you have your own wheels, but it's worth a drive for the glossy indigo views from the uppermost vantage point. Beware the mischievous troop of monkeys that lives here.
Driving into the large site, power plant staff will hand you a ticket and wave you inside. Keep driving to reach two lookout points, the first over hilly countryside, and the second at the top of the dam.