Hranice Abyss (, Hranice

#59 of 93 in Things to do in Olomouc Region
Landmark · Hidden Gem · Tourist Spot
The Hranice Abyss (Czech: Hranická propast), the English name adopted by the local tourist authorities, is the deepest flooded pit cave in the world. It is a karst sinkhole located near the town of Hranice. The greatest confirmed depth (as of 27 September 2016) is 473 m (404 m under the water level), which makes it the deepest known underwater cave in the world. Moreover, the expected depth is 800–1200 m. In August 2020, a scientific campaign to the cave revealed that it is 1 kilometer deep.
The Hranice Abyss was created by a collapse of the cave roof, which was eaten away by warm carbonic acidulous spring water in limestone.
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TripAdvisor traveler rating 4.5
9 reviews
  • Quite an anonymous looking hole for such a great record/title. But something I didn't know before today. A gentle walk through well established paths in a forested area takes you to... The Hranice...  more »
  • The history of the abyss is very interesting. I recommend going down to see the abyss from the inside. You can also take walk from Hranice to Teplice via the abyss. There are nice viewpoints, nature and it is not far at all.
  • Beautiful place. Deepest abyss.

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