is a valley reservoir on the Elbe River built in 1920. It is located near the Tešnov village in the cadastral area of Bílá Třemešná, 4 km upstream from Dvůr Králové nad Labem, in a narrow valley that runs through the Kocléřovský ridge. It is bordered on its left bank by the large forest complex of Království, a remnant of the old border forest after which the dam got its name.
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