The Mainlinie (German for "Main-line") refers to the historical and political boundary between northern and southern Germany along the River Main. The line delimitates the spheres of influence of

Austria Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous ...

and

Prussia Prussia, , Old Prussian: ''Prūsa'' or ''Prūsija'' was a German state on the southeast coast of the Baltic Sea. It formed the German Empire under Prussian rule when it united the German states in 1871. It was ''de facto'' dissolved by an e ...

in the

German Confederation The German Confederation (german: Deutscher Bund, ) was an association of 39 predominantly German-speaking sovereign states in Central Europe. It was created by the Congress of Vienna in 1815 as a replacement of the former Holy Roman Empire, w ...

during the 19th century. The seat of the German Confederation,

Frankfurt am Main Frankfurt, officially Frankfurt am Main (; Hessian: , " Frank ford on the Main"), is the most populous city in the German state of Hesse. Its 791,000 inhabitants as of 2022 make it the fifth-most populous city in Germany. Located on it ...

, sat upon the line.

Geography

Eventually, the Main line became the southern boundary of the

North German Confederation The North German Confederation (german: Norddeutscher Bund) was initially a German military alliance established in August 1866 under the leadership of the Kingdom of Prussia, which was transformed in the subsequent year into a confederated st ...

. As such, the Main line did not follow the Main River exactly. Rather, the line went east to west: firstly, along the northern border of the

Kingdom of Bavaria The Kingdom of Bavaria (german: Königreich Bayern; ; spelled ''Baiern'' until 1825) was a German state that succeeded the former Electorate of Bavaria in 1805 and continued to exist until 1918. With the unification of Germany into the German ...

; then, along the river Main to

Mainz Mainz () is the capital and largest city of Rhineland-Palatinate, Germany. Mainz is on the left bank of the Rhine, opposite to the place that the Main joins the Rhine. Downstream of the confluence, the Rhine flows to the north-west, with Ma ...

; and finally, along the western border of the

Grand Duchy of Hesse The Grand Duchy of Hesse and by Rhine (german: link=no, Großherzogtum Hessen und bei Rhein) was a grand duchy in western Germany that existed from 1806 to 1918. The Grand Duchy originally formed from the Landgraviate of Hesse-Darmstadt in 18 ...

and the Bavarian Palatinate towards the French border. The line split Hesse at Frankfurt am Main, but all of Frankfurt am Main belonged to the North German Confederation. Today, the Main line is viewed as the boundary between northern and southern Germany. Both regions have distinct

linguistic Linguistics is the scientific study of human language. It is called a scientific study because it entails a comprehensive, systematic, objective, and precise analysis of all aspects of language, particularly its nature and structure. Linguis ...

and

cultural Culture () is an umbrella term which encompasses the social behavior, institutions, and norms found in human societies, as well as the knowledge, beliefs, arts, laws, customs, capabilities, and habits of the individuals in these groups.T ...

differences.

References

19th century in Germany History of Prussia 19th century in Austria German Confederation {{Germany-stub