There are a few buses and minivans from Pakse that include a boat ride to Si Phan Don. If you are travelling from Cambodia, you can take a van from Kratie, Stung Treng or Banlung for about 15$, which also include a boat ride to Don Det or Don Khong.
Cascades de Kuang Si
Il existe de nombreuses options pour se rendre aux cascades : en tuk tuk, en moto, en voiture, à vélo ou en bateau sur la rivière.