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. Founded in 1909 by eighteen football players from Dortmund, 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. Borussia Dortmund have won eight German championships, four DFB-Pokals, five DFL-Supercups, one UEFA Champions League, one UEFA Cup Winners' Cup, and one Intercontinental Cup. Their Cup Winners' Cup win in 1966 made them the first German club to win a European title. Since 1974, Dortmund have played their home games at Westfalenstadion, named after its home region of Westphalia. The stadium is the largest in Germany and Dortmund has the highest average attendance of any association football club in the world. Borussia Dortmund's colours are black and yellow, giving the club its nickname die Schwarzgelben. Dortmund holds a long-standing rivalry with Ruhr neighbours Schalke 04, known as the Revierderby.