1. Reed Flute Cave, Northwest of Guilin in Southern China
2. Puerto Princesa Underground River, Northern Coast of the Island of Palawan in the Philippines
![Puerto Princesa Underground River, Northern Coast of the Island of Palawan in the Philippines](https://www.ecstasycoffee.com/wp-content/uploads/2014/12/Puerto-Princesa-Underground-River-Northern-Coast-of-the-Island-of-Palawan-in-the-Philippines.jpg)
3. Krubera Cave, Arabika Massif on the edge of the Black Sea in Abkhazia
source: mymodernnet
4. Jeita Grotto
5. Fingal’s Cave Staffa Island, Scotland
6. Lechuguilla Cave, New Mexico, USA
credit: NPSA
7. Skocjan Caves
8. Orda Cave, Longest Underwater Cave in Russia
9. The Call of the Abyss, Arabika Massif, Abkhazia
credit: flickr/argenberg
10. Mendip's Reservoir Hole, England
credit: nick chipchase
11. The Marble Cathedral, General Carrera Lake in Chile
12. Majlis al Jinn Cave, Selma Plateau in Oman
13. La Grotte Aux Fees, Valais, Switzerland
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