Bundesautobahn 10 (translates from German as Federal Motorway 10, short form Autobahn 10, abbreviated as BAB 10 or A 10) is an orbital motorway around the German capital city of Berlin. Colloquially called Berliner Ring, it is predominantly located in the state of Brandenburg, with a short stretch of 5 km (3 miles) in Berlin itself. It should not be confused with the Berliner Stadtring (Bundesautobahn 100) around Berlin's inner city. With a total length of 196 km (122 miles), the BAB 10 is the longest orbital in Europe, being 8 km (5 miles) longer than the M25 motorway around London. From Wikipedia
