Ottweiler is a municipality, former seat of the district of Neunkirchen, in Saarland, Germany. It is situated on the river Blies, approx. 7 km north of Neunkirchen, and 25 km northeast of Saarbrücken.
Wikipedia https://en.wikipedia.org/wiki/Ottweiler
Coordinates 49°24'10.961" N 7°9'47.328" E