Třinec  is a town in Frýdek-Místek District, Moravian-Silesian Region and it lies on the Olza River. The town is notable for its steel plant, the Třinec Iron and Steel Works, largest one in the Czech Republic, which still has a major impact on the town, on its character, demographics and air pollution.

Třinec belong to the most religionistic cities of the Czech Republic, as in the census in 2011 it signed a religion, 60.5% of the population. Religious believers groups are very diverse – in addition to Roman Catholics in their congregations a number of Protestant churches.

Although the majority of the town’s population speak Czech, a large number speaks in a Cieszyn Silesian dialect, a mixture of Czech, Polish and German. The dialect is very specific to the whole region.