Heilbronn is a city in northern Baden-Württemberg, Germany. It is surrounded by Heilbronn County and, with approximately 123,000 residents, it is the sixth-largest city in the state. The city on the Neckar is a former Imperial Free City and is the seat of Heilbronn County. Heilbronn is also the economic center of the Heilbronn-Franken region that includes most of northeast Baden-Württemberg. Heilbronn is known for its wine industry and is nicknamed Käthchenstadt, after Heinrich von Kleists Das Käthchen von Heilbronn.