of the border and from both nationalities continue to refer to the river as the Olza nevertheless. Towns and villages on the river (from source to the mouth) Istebna (PL) Bukovec Písek Jablunkov Návsí Hrádek Bystřice Vendryně Lyžbice Třinec Konská Ropice Český Těšín / Cieszyn (PL) Chotěbuz Pogwizdów (PL) Louky nad Olší Kaczyce (PL) Darkov Fryštát Karviná Dětmarovice Závada Godów (PL) Věřňovice Kopytov Olza (PL) Gallery Footnotes References Rivers of Silesian Voivodeship Rivers of the Moravian-Silesian Region Frýdek-Místek District Karviná District Silesian Beskids Cieszyn Silesia International rivers of Europe Czech Republic–Poland border Border rivers