Teschener Schlesien

Cieszyn Silesia Těšínské Slezsko / Těšínsko (in Czech) Śląsk Cieszyński (in Polish) Teschener Schlesien / Olsagebiet (in German)
Historical Region
Cieszyn Silesian landscape seen from Velká Čantoryje/Wielka Czantoria
Coat of arms
Polish map of Cieszyn Silesia. The solid black line is the historical border of the region, and the broken black line is the international border.
Cieszyn Silesia Show map of Poland Cieszyn Silesia Show map of Czech Republic Location of Cieszyn Silesia in Poland and the Czech Republic
Coordinates: 49°44′56″N 18°37′34″E / 49.749°N 18.626°E / 49.749; 18.626
Country	Poland  Czech Republic
Area
• Total	2,280 km2 (880 sq mi)
Population
• Total	810,000
• Density	360/km2 (920/sq mi)

Cieszyn Silesia or Těšín Silesia or Teschen Silesia (Polish:  Śląsk Cieszyński, Czech:  Těšínské Slezsko or  Těšínsko, German: Teschener Schlesien or Olsagebiet) is a historical region in south-eastern Silesia, centered on the towns of Cieszyn and Český Těšín and bisected by the Olza River. Since 1920 it has been divided between Poland and Czechoslovakia, and later the Czech Republic. It covers an area of about 2,280 square kilometres (880 sq mi) and has about 810,000 inhabitants, of which 1,002 square kilometres (387 sq mi) (44%) is in Poland, while 1,280 square kilometres (494 sq mi) (56%) is in the Czech Republic.