Roman legionary fortresses in Germany

Bonn, () officially the Federal City of Bonn, () is a federal city in the German state of North Rhine-Westphalia, located on the banks of the Rhine. With a population exceeding 300,000, it lies about south-southeast of Cologne, in the southernmost part of the Rhine-Ruhr region.

thumb|Satellite view of Mainz (south of the Rhine) and Wiesbaden

Neuss (; written Neuß until 1968; ; ) is a city in North Rhine-Westphalia, Germany. It is on the west bank of the Rhine opposite Düsseldorf. Neuss is the largest city within the Rhein-Kreis Neuss district. It is primarily known for its historic Roman sites, as well as the annual Neusser Bürger-Schützenfest. Neuss and Trier share the title of "Germany's oldest city", and in 1984 Neuss celebrated the 2000th anniversary of its founding in 16 BCE.

Xanten (, Low Rhenish: Santen) is a town in the state of North Rhine-Westphalia, Germany. It is located in the district of Wesel.

Mogontiacum (also Moguntiacum) is the Latin name of today's city of Mainz, which it bore during its almost 500 years as part of the Roman Empire. Mogontiacum had its origins in the legionary camp built by Drusus in 13/12 BCE, which was strategically located on a above the Rhine and opposite the mouth of the Main on the .