White - and Red Saar are their sources.
With a length of 235 km it is the largest tributary of the Moselle river. Its loop near Orscholz is world famous. Located west of the Saar river lies the mountain range Saargau. It passes from Berus across the French border, Saarland to Rhineland-Palatinate (Konz). This area was already divided by the Franks in the 7th century. The Upper Saargau (Merzig) belonged to the diocese of Metz and the Lower Saargau (to Saarburg) to the Erbbistum Trier. Today, Saargau is understood to mean only the lower part. From the view point "Kasteler Plateau" you can look over these two parts. While in the upper part of the Saar river, the landscape is rather flat, wide, and hilly, the lower part is rather steeply. The boundaries of today's Saargau can be described as follows: in the east flows the Saar river, in the west - the Moselle, in the north is the border to Rhineland-Palatinate and in the south the Niedtal.