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Ostrava (pronounced Cs-Ostrava.ogg [ˈostrava] (help·info), German: Ostrau, Polish: Ostrawa) is the third largest city in the Czech Republic, however it is the second largest urban agglomeration after Prague. It is also the administrative center of the Moravian-Silesian Region and of the Municipality with Extended Competence. Ostrava is located at the confluence of the Ostravice, Oder, Lučina and Opava rivers. Its history and growth have been largely affected by exploitation and further usage of the high quality black coal deposits discovered in the locality, giving the town a look of an industrial city and a nickname of the “steel heart of the republic” (Czech: ocelové srdce republiky) during the communist era of Czechoslovakia. Many of the heavy industry companies are being closed down or transformed nowadays.

Ostrava was an important crossroads of prehistoric trading routes, namely the Amber Road. Archaeological finds have proved that the area around Ostrava has been permanently inhabited for 25,000 years. The town itself was founded in 1267. Until the late 18th century, Ostrava was a small provincial town with a population around one thousand inhabitants engaged in handicraft.

In 1763, large deposits of black coal were discovered, leading to an industrial boom and a flood of new immigrants in the following centuries. During the 19th century, several mine towers were raised in and around the city and the first steel works were established. Industrial growth was made possible by the completion of Kaiser-Ferdinands-Nordbahn from Vienna in 1847. The 20th century saw further industrial expansion of the city accompanied by an increase in population and the quality of civic services and culture. However, during World War II, Ostrava - as an important source of steel for the arms industry - suffered several massive bombing campaigns bringing large amounts of damage to the city.

Since the Velvet revolution in 1989 the city is going through big changes. A thorough restructuring of industry is taking place - coal mining in the area of the city was stopped in 1994 and a large part of the Vítkovice ironworks near the city center was closed down in 1998, both improving the environment dramatically, although the Arcelor Mittal plant (ex-Nová Huť) continues to heavily pollute the Radvanice district and surrounding area, resulting in one of the highest concentrations of PM10 dust in Europe.