Koblenz is a German city on the banks of the Rhine and of the Moselle, a multi-nation tributary.

Koblenz was established as a Roman military post by Drusus around 8 B.C. Its name originates from the Latin (ad) confluentes, meaning "(at the) confluence". The actual confluence is today known as the "German Corner", a symbol of the unification of Germany that features an equestrian statue of Emperor William I. The city celebrated its 2000th anniversary in 1992.

It ranks in population behind Mainz and Ludwigshafen am Rhein to be the third-largest city in Rhineland-Palatinate. Its usual-residents' population is 112,000 (as at 2015). Koblenz lies in a narrow flood plain between high hill ranges, some reaching mountainous height, and is served by an express rail and autobahn network. It is part of the populous Rhineland.

Its defensive works are extensive, and consist of strong forts crowning the hills encircling the city to the west, and the citadel of Ehrenbreitstein on the opposite bank of the Rhine. The old city was triangular in shape, two sides being bounded by the Rhine and Mosel and the third by a line of fortifications. The latter were razed in 1890, and the city was permitted to expand in this direction. The Koblenz Hauptbahnhof (central station) was built on a spacious site outside the former walls at the junction of the Cologne-Mainz railway and the strategic Metz-Berlin line. In April 2011 Koblenz-Stadtmitte station was opened in the inner city to coincide with the opening of the Federal Garden Show 2011. The Rhine is crossed by the Pfaffendorf Bridge, originally the location of a rail bridge, but now a road bridge and, a mile south of city, by the Horchheim Railway Bridge, consisting of two wide and lofty spans carrying the Lahn Valley Railway, part of the Berlin railway referred to above. The Moselle is spanned by a Gothic freestone bridge of 14 arches, erected in 1344, two modern road bridges and also by two railway bridges.

Since 1890, the city has consisted of the Altstadt (old city) and the Neustadt (new city) or Klemenstadt. Of these, the Altstadt is closely built and has only a few fine streets and squares, while the Neustadt possesses numerous broad streets and a handsome frontage along the Rhine.