Les Království Reservoir, Reservoir with gothic architecture in Bílá Třemešná, Czech Republic

Les Království is a reservoir with gothic-style architecture in Bílá Třemešná, Czech Republic. The dam extends 218 meters in length and reaches 41 meters in height, with stone towers featuring battlements that resemble a castle.

Construction ran from 1910 to 1920, delayed by the First World War, after the flood of 1897 led to plans prepared from 1903 by Josef Plicka's river-regulation department in Prague. The J. V. Velflík firm built the structure for 4.7 million Austrian crowns, with machinery from Fanta and Jireš; a hydroelectric plant was added in 1923.

The name Království means Kingdom and reflects the royal forests that once covered this area. The stone battlements and towers give the structure the appearance of a medieval fortress, though it is a modern engineering work.

Visitors can follow marked walking paths along the shore that offer different views of the dam. A parking area sits near the dam entrance, making it easy to reach the grounds.

The dam was declared a national cultural monument in 2010, recognizing its technical and architectural importance. It combines flood control with power generation, which was an advanced solution when it was completed.