La Ong Rung Waterfall (Rainbow Waterfall) is situated on the boundary between Amphoe Than To and Amphoe Betong, about 90 kms. on the Yala-Betong Road from Amphoe Muang. Turn right onto a dirt road at about 40 kms. before reaching Amphoe Betong, and go for another 100 metres. The slippery trek that runs along the stream from the waterfall calls for precaution. During the rainy season, the waterfall produces the effect of a rainbow, hence the name.