The biggest underground lake (Namibia)

I have just found out that the biggest underground lake  (almost 2 hectares, 20000 m^2) is located in Namibia:
 




(source: Namgrows 2010)


 It is about 100 m below the ground level  and, as you can guess, it is not that easy to visit it!


(source: Namgrows 2010)

Did I mention that it got an awesome name too? It's called the Dragon's breath!

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