Rhine-Neckar in the context of "Bad Dürkheim"

Heidelberg (/ˈhaɪdəlbɜːrɡ/; 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 centre 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. The old town lies in the valley, the end of which is flanked by the Königstuhl in the south and the Heiligenberg in the north. The majority of the population lives in the districts west of the mountains in the Upper Rhine Plain, into which the city has expanded over time.

Mannheim (German pronunciation: [ˈmanhaɪm] ; Palatine German: Mannem or Monnem), officially the University City of Mannheim (German: Universitätsstadt Mannheim), is the second-largest city in Baden-Württemberg after Stuttgart, the state capital, and Germany's 21st-largest city, with a population of over 315,000. It is located at the border with Rhineland-Palatinate. The city is the cultural and economic centre of the Rhine-Neckar, Germany's seventh-largest metropolitan region, with nearly 2.4 million inhabitants.

Mannheim is located at the confluence of the Upper Rhine and the Neckar in the Kurpfalz (Electoral Palatinate) region of northwestern Baden-Württemberg. The city lies in the Upper Rhine Plain, Germany's warmest region, between the Palatine Forest and the Oden Forest. Mannheim forms a continuous urban zone of around 500,000 inhabitants with Ludwigshafen am Rhein in the Rhineland-Palatinate, while some northern suburbs lie in Hesse; Hamburg is the only other German city with a presence in two states other than its own.

The Stuttgart Metropolitan Region is a metropolitan region in south-west Germany consisting of the cities and regions around Stuttgart, Heilbronn, Tübingen/Reutlingen. These cities are arranged into three agglomeration areas. The population of the area is about 5,300,000 and it is one of the biggest regions in Germany. This area covers an area of ca 15,000 km.

The Stuttgart metropolitan region is roughly 200 km south of Frankfurt, 200 km west of Munich and about 600 km east of Paris. Other metropolitan areas around are Rhine-Neckar, Frankfurt Rhine-Main, Nuremberg Metropolitan and Munich Metropolitan.