The Möhne Reservoir is an artificial lake in North Rhine-Westphalia, some 45 km east of Dortmund, Germany. The lake is formed by the damming of two rivers, Möhne and Heve. This stamp was issued on 2 May 2013, to commemorate the 100th anniversary of the dam.
The Moselle, Mosel or Musel is a river that rises in the Vosges mountains and flows through north-eastern France, Luxembourg, and western Germany.
These stamps were issued on 7 April 2016. I received both, but on different envelopes. This is how they look like together: