Bohumín is a town in Karviná District, Moravian-Silesian Region, Czech Republic on the border with Poland. The confluence of the Oder (Odra) and Olza Rivers is situated just north of the town. The town lies in the historical region of Cieszyn Silesia. Bohumín consists of Old Bohumín and industrial New Bohumín, while several villages are administratively part of the town. The majority of citizens are Czech; many citizens have Polish ancestry, although the Polish minority in Bohumín is small. Before World War II, the town was inhabited by a large German community, nowadays the city is known as one of the largest community of Romani People in the Czech republic.
At the end of the 19th century a wire and rolling mill was built by German industrialists from Berlin, Albert Hahn and Heinrich Eisner. In 1872 the important Kassa-Oderberg railway line was opened to traffic; this increased the town's importance and contributed to the Polish - Czechoslovak dispute over Cieszyn Silesia after World War I.