Malá Amerika, Flooded limestone quarry in Karlštejn, Czech Republic

Malá Amerika, also known as Rešna, is a flooded limestone quarry in Karlštejn, Czech Republic. The quarry is 165 meters long, and its bottom is flooded to form Rešenské Lake, which covers 0.86 hectares and is 165 meters long and 57 meters wide.

The quarry was mined for limestone for many years before it was abandoned and gradually filled with water. In the 20th century, it became part of the Karlštejn National Nature Reserve, and since then nature has reclaimed the site.

The name Malá Amerika, meaning Little America, is shared with other quarries in the area, and locals often refer to this one as Rešna or Školka. The lake is a popular spot for divers and climbers, who come to explore the underwater walls and the surrounding rock faces.

You can reach the quarry on foot by following the yellow hiking trail from Mořina or from the Dub sedmi bratří. The trail is well marked, but the terrain around the quarry is uneven, so wear sturdy shoes and watch your step near the edges.

The lake has no surface inlet or outlet, and its water level is maintained by underground springs. A small peninsula on the north side can only be reached by boat or by climbing down from the gallery windows.