Borussia Dortmund is a sports club in Germany.
Borussia Dortmund . Dortmund plays in the Bundesliga , the top tier of the German football league system . Bundesliga . Bundesliga [ ˈeːɐ̯stə ˈbʊndəsˌliːɡa ] ) , is a professional association football league in Germany and the football league with the highest average stadium attendance worldwide .