- Source: Sondern, Radevormwald
Sondern is a small village approximately 6 kilometres (3.7 mi) the north of Radevormwald, in Oberbergischer Kreis district, North Rhine-Westphalia, Germany. It lies to the south of Remlingrade, and close to Birken, Im Kamp, and Herkingrade. Politically the village is represented by candidates of the electoral district 170 of the Radevormwald city Council. Around the year 1400 the village was mentioned as "Sunderen" in documents of the archives of the Reformed church in Radevormwald in connection with the description of the boundaries of the Free Court of Radevormwald at the time.