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- 01The Martel Chamber inside Škocjan is 308 metres long, 89 metres wide, and 146 metres tall — among Earth's largest underground spaces.
- 02The Reka River's underground section drops 163 metres in elevation before emerging as the Timavo River near the Adriatic coast.
- 03The caves have been a UNESCO World Heritage Site since 1986, partly for their underground ecosystem of endemic species.