Tara River (Montenegro). 'It’s hard to get a decent view of the beautiful Tara Canyon – its tree-lined walls, up to 1300m high, tend to get in the way. The effect is most impressive from the water, which goes some way to explaining why rafting is such a popular activity. You’ll hit a few rapids but outside of April and May it’s a relatively gentle experience, gliding over crystalline waters through a landscape untouched by human hands.' http://www.lonelyplanet.com/montenegro
The Pannonian Plain is a large plain in Central Europe that remained when the Pliocene Pannonian Sea dried out. It is a geomorphological subsystem of the Alps-Himalaya system. The river Danube divides the plain roughly in half. The plain is divided among Austria, Bosnia and Herzegovina, Croatia, the Czech Republic, Hungary, Romania, Serbia, Slovakia, Slovenia and Ukraine.