Main River / Danube / river Don / Rhine River / Moselle River / Sea of Azov / Black Sea / Gulf of Gdansk / Great Lakes / Aegean Sea / Scheldt River / river Danube / Sava River / Baltic Sea / river Ural / Caspian Sea / Danube River / river Dniestr / river Dniepr / Rhine / /
Organization
French National Agency for Water and Aquatic Environments / European Committee for Standardisation / /