Zaolzie forms the eastern part of the czech portion of. Its name comes from the olza river. The term zaolzie denotes the territory of the former districts of český těšín and fryštát, in which the polish population formed a majority according to the 1910 austrian census.
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Zaolzie is part of the historical region of cieszyn silesia, the region which was divided in 1920 between czechoslovakia and poland.
The term zaolzie denotes the territory of the former districts of český těšín and fryštát, in which the polish population formed a majority according to the 1910 austrian census.
Zaolzie is a part of the former duchy of teschen (cieszyn in polish), now part of the czech republic, which was ruled from 1290 until 1653 by a branch of the piasts, or the polish royal.
