Heidelberg (German: [ˈhaɪdl̩bɛʁk] ; Palatine German: Heidlberg) is the fifth-largest city in the German state of Baden-Württemberg, and with a population of about 163,000, of which roughly a quarter consists of students, it is Germany's 51st-largest city. Located about 78 km (48 mi) south of Frankfurt, Heidelberg is part of the densely populated Rhine-Neckar Metropolitan Region which has its center in Mannheim. Heidelberg is located on the Neckar River, at the point where it leaves its narrow valley between the Oden Forest and the Little Oden Forest, and enters the wide Upper Rhine Plain.
https://en.wikipedia.org/wiki/Heidelberg