This is a bit misleading, but if you take a look at the archive for the x-nudism site from late 2002:
http://web.archive.org/web/200212011.../x-nudism.com/
You'll see the same river, but with different listed locations. Where it says "Black Sea Coast", "Filaki Beach", and "Banana Beach", notice that all the pics were shot at the same beach. So, those locations must be fraudulent. In the past, I researched Banana Beach (Greek Island) and could not find a river. I didn't spend a whole lot of time researching it, but it was wasted nonetheless.
I know that some x-nudism were shot at Koktebel. But none of the Beach #1 or Beach #2 stuff was shot there.
I wanted to point this out because if I had bad information, it is possible that others might have had bad info. That may be why we focused on St. Petersburg initially.