The Russian letter з which is the letter for a voiced s is mostly romanised as z, but since in English s also often represents the voiced s, I was thinking you might accept it, since not everyone has seen the Sea of Azov written out before, but still know of its existance and name and would thus like credit for this knowledge independent of their Cyrillic romanisation skills. (Interestingly, this comment includes proof of s being used as a representative for the voiced s sound, since British orthography dictates -isation be written with s.)
-inspired by KoljiVriVoda's quiz "Seas on the World Map"
-I have no idea why the answers don't contain the typical JetPunk green or red
-I tried to make it as accurate as possible. Some minor faults might be included
Enjoy!