>>10679356As I have said, the Caucasus, that is, the Stavropol region, the Astrakhan Oblast (that produses the most in quantity, too). There's also Krasnodar and even Moscow region ones, too.
There are MANY kinds, but there's not very much difference, really.
Maybe it's just because I've personally tried, like, 3-4 out of dozens of kinds that grow here, so yeah, you have to be dedicated to try them all and become somewhat of a watermelon sommelier to find out all the flavors available and distinguish them from each other.