Internationalization of the Danube River

The Danube River has been a trade waterway for centuries, but with the rise of international borders and the jealousies of national states, commerce and shipping has often been hampered for reasons of conflict and parochialism rather than cooperation between various powers in control of parts of the river. In addition, natural features of the river, most notably the sanding of the Danube Delta, has often hampered international trade.

Source: Wikipedia — Internationalization of the Danube River (CC BY-SA 4.0)