Hi! I'm from Ukraine. Thank you for adding us to Central Europe! It's our dream which hardly can come true...
Some time ago I've started a topic here about a marshlands in Ukraine:
viewtopic.php?f=10&t=2814&start=0If we want to speak about real quicksand, well, it exists on dredged beaches of the rivers, and as I heard it exists on the natural sandy banks of Dnieper where it flows into the Black Sea. Dredged beaches were usual thing many years ago, but now shipping on our rivers almost stopped, and dredging of fairways became rare thing. They do dump dredged sand as a base for construction, but I don't think such places are appropriate for sinking. (However, very likely they are appropriate for serious accidents, I have heard about such accidents 40 years ago, but not recently)
I know here are guys from Hungary and Czech Republic, but they write comments rather rarely...