Tad Fan is maybe one of the most well-known waterfall of the Bolaven Plateau. Located on the 38km mark from Pakse turn right and follow the dirt road (you cannot miss the big sign for it). At the end if the road you find a car park with an area for bikes. Do not be surprised if you see a few minibuses, as it is a popular stop for the day trips from Pakse.
From the car park follow the path and you arrive at the entrance of the Tad Fane resort. From here you can either enjoy the view of the waterfall from the restaurant, or the viewing platform. From either places you get a fantastic view of a very impressive waterfall.