The "Black Sea" has been inspired by one of the weirdest waves on the planet! A lake wave! Oh yeah, the Black sea is not a lake today, but it was until 7000 years ago when the Mediterranean sea merged into the lake and enabled the overflow of saltwater into the lake!
Anyway, we are talking still of a giant lake, capable of producing waves! Most of the time, waves are tiny. Nevertheless, we are still talking about a lake, and sometime you could get a decent winter swell!
Also, surfing in the black sea (any of the surf spots) is considered one of the safest place in the world, with precisely ZERO sharks around you! Zero is not only the number of sharks but even the temperature that you could get in winter!