Bithynia was an ancient province on which sea?
Marea Neagră BLACK SEA Black Sea shelf Black Sea littoral Черноморский Black sea შავი ზღვის შავი ზღვა Euxine Чорноморський The Black Sea Black seas Schwarzes Meer Pontus Euxinus Pontus Euxinos Euxine Sea Black Sea Kara Deniz Черно море