Calm
Ruhden is a German place name:
- Ruhden , Johannisburg district, East Prussia, since 1945: Ruda (Biała Piska) , town in the powiat Piski, Warmian-Masurian Voivodeship
- Ruhden , 1938 to 1945 ironworks , Lötzen district, East Prussia, since 1945: Ruda (Miłki) , town in the Giżycko powiat, Warmian-Masurian Voivodeship