former open-air operetta festival on a river stage in Koblenz, Germany (1950-1970)
- Where
- Koblenz, Germany
- Running since
- 1950
former open-air operetta festival on a river stage in Koblenz, Germany (1950-1970)
former open-air operetta festival on a river stage in Koblenz, Germany (1950-1970)
former open-air operetta festival on a river stage in Koblenz, Germany (1950-1970)