This image is an illustration of the city of Koblenz, Germany, which is situated at the confluence of the Mosel and Rhine Rivers.
The description translates roughly as:
Koblenz, at the mouth of the Moselle in the Rhine, may be proud of its incomparable landscape. Its location opposite the Ehrenbreitstein Fortress, means Koblenz forms one of the most interesting points on the Rhine.
–The Ehrenbreitstein Fortress overlooks the city from across the Rhine.
This image likely dates from the 1920s.