Germania Superior ("Upper Germania"), so called because it lay upstream of Germania Inferior, was a province of the Roman Empire. It comprised an area of western Switzerland, the French Jura and Alsace regions, and southwestern Germany. Important cities were Besançon (Besontio), Strasbourg (Argentoratum), Wiesbaden (Aquae Mattiacae), and Germania Superior's capital, Mainz (Mogontiacum). It comprised the Middle Rhine, bordering on the Limes Germanicus, and on the Alpine province of Raetia to the south-east. Although it had been occupied militarily since the reign of Augustus, Germania Superior (along with Germania Inferior) was not made into an official province until c. 85 AD.