Olza, Border river between Czech Republic and Poland.
The Olza flows through the Silesian Beskids from its source near Istebna for about 89 kilometers until it joins the Oder River. Along this path, it forms a natural boundary while passing through various towns and valleys that line its banks.
The river was first recorded in writing in a 1290 letter from Duke Mieszko. By 1611, it appeared in documents under the name Oldza.
The river holds significance for both Czech and Polish communities, marking their shared border for 25 kilometers through numerous towns and settlements.
Cyclists can follow the marked route 56 starting from Jablunkov, which runs along the river with clear signs. The path guides you through border areas and recreational zones suitable for outdoor activities.
The river is home to protected species such as brook lampreys and bullheads living in its waters. Kingfishers nest in the clay banks and use the river as their hunting ground.
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