Ballspielverein Borussia 09 e.V. Dortmund, commonly known as Borussia Dortmund, BVB, or simply Dortmund, is a German sports club based in Dortmund, North Rhine-Westphalia (Borussia is the Latin equivalent of Prussia). The football team is part of a large membership-based sports club with more than 145,000 members, making BVB the second largest sports club by membership in Germany. Dortmund plays in the Bundesliga, the top tier of the German football league system. Dortmund is one of the most successful clubs in German football history.