The blue water
Dissolved limestone minerals give the water its blue-green colour.
Pavel Koběrský — CC BY-SA 2.5 · Bukvoed — CC BY 4.0 · Bukvoed — CC BY 4.0 · Bukvoed — CC BY 4.0
No, and it is forbidden. Reaching the water means climbing friable unfenced walls, and people have fallen and died here. The water itself is cold and deep with no rescue of any kind. Viewing from the upper rim is the point, and it is entirely sufficient for the sight.
By car it is about forty minutes south-west and easiest. By public transport, a train towards Beroun, getting off at a nearby station and walking about an hour through woodland — a fine walk in itself in good weather. Nothing runs directly to the rim.
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An abandoned limestone quarry filled with blue groundwater, ringed by vertical white walls close to sixty metres high. It is known locally as the Czech Grand Canyon. Stone was cut here until the 1960s, when the pumps stopped and the floor filled with water. The blue-green colour comes from dissolved limestone minerals. This must be said plainly because it matters for safety: descending to the water and swimming are forbidden, most of the rim is unfenced and the rock is friable, and people have fallen and died here. Viewing is from the lookout points on the upper rim and the path that circles it — and that is the actual attraction. The site lies in the Bohemian Karst, and the walking route links it to the nearby Malá Amerika and Mexiko quarries and to Karlštejn Castle. There are no tickets and no hours; the visit is a walk in open country.
Dissolved limestone minerals give the water its blue-green colour.
It links to the nearby Malá Amerika and Mexiko quarries.
The castle is close, and the two make one complete day.
Near Karlštejn, about thirty kilometres south-west of Prague