River's guide to Slovak is offering to you slovak river longer then
40 km with these describes: Source of river, Lenght of river in km (ride down),
Difficulty in separate parts of river with start and end names of towns or brooks,
start and end number of river km in this difficulty,
conditions for ship, the best and dangerous part on river. The rivers are navigable in sping from snow, but Hron, Váh are navigable almost all year.