Olza (river)
…through territories of Bukovec, Písek, Jablunkov, Návsí, Hrádek, Bystřice, Vendryně, Třinec and Český Těšín. Here it begins to form the state border with Cieszyn, Pogwizdów and Kaczyce on the Polish side and Chotěbuz on the Czech side. The river then continues through the territories of Karviná, Dětmarovice and…