The tallest and most spectacular of the three waterfalls west of Ban Lung is 25m-high Chaa Ong. It's set in a jungle gorge and you can clamber behind the waterfall or venture underneath for a power shower. However, it dries up from about January to May. The Chaa Ong turn-off is on the right (north) side of NH19 about 200m west of the new bus station.
The waterfall is 5.5km from the highway along a dirt road. The drive to the waterfalls can be very slippery in the wet season so think twice about driving yourself on a motorbike.