Třemošná (river)

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Třemošná is a river in the Czech Republic. It is a left tributary of the Berounka River and flows through the Plzeň Region. The river is about 43.7 kilometers long. It begins in Krsy in the Rakovník Uplands at about 600 meters above sea level and joins the Berounka at Kaceřov at about 278 meters above sea level. The drainage basin covers about 249 square kilometers, and the average flow near the mouth is about 0.62 cubic meters per second.

The Třemošná flows through several towns: Krsy, Úněšov, Všeruby, Nevřeň, Příšov, Ledce, Třemošná, Česká Bříza, Hromnice, Jarov, and Kaceřov. There are around 180 bodies of water in the basin; the largest is the Hamr fishpond, about 13.4 hectares in size, fed by the Bělá. A system of small fishponds is built on the upper part of the Třemošná.

The name Třemošná comes from the word střemcha, meaning “bird cherry.” The river’s water eventually reaches the sea through a long path: Berounka → Vltava → Elbe → North Sea.