Buczynowa Siklawa is one of the highest waterfalls in Poland, located in the valley of the river Roztoki, Bukowina Tatrzańska.
Dolinie Roztoki can be reached from the parking Palenica Białczańska, south of Lysa Polana. From here it is a firm walk, 2-3 hours (I think). I am not sure if it is possible to drive further then the parking. In that case the walk should be much shorter.
Buczynowa Siklawa is located on an altitude of 1.550 meter and drops down form the mountains over more the a hundred meters. After rainfall you really see how big this waterfall can be.