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Heidelberg is a city in Baden-Württemberg, Germany. As of 2006, over 140,000 people live within the city's 109 square kilometres (42 sq mi) area. The town of Heidelberg is an administrative district of its own. Although not being part of it, the Rhein-Neckar-Kreis, the rural district, which surrounds the town, has its seat in Heidelberg.

Heidelberg lies on the river Neckar at the point where it leaves its narrow, steep valley in the Odenwald to flow into the Rhine valley where, 20 kilometres (12 mi) Northwest of Heidelberg, it joins the river Rhine at Mannheim. Heidelberg is part of a densely populated region known as the Rhein-Neckar-Triangle.