Where is Mainz located?

Mainz is the capital and largest city of Rhineland-Palatinate, Germany. The city is located on the Rhine river at its confluence with the Main river, opposite Wiesbaden on the border with Hesse. Mainz was founded by the Romans in the 1st Century BC during the Classical antiquity era, serving as a military fortress on the northernmost frontier of the Roman Empire and as the provincial capital of Germania Superior.