The world's largest water cave   

August 8, 2016 - 12:12

The Ali Sadr Cave, located 75 km north of Hamedan in western Iran, is the world's largest water cave which attracts millions of visitors every year.  The cave dates back to the second Jurassic period (130-190 million years ago). Its walls can extend up to 40 meters high and contains several large and deep lakes. A river flows through the cave and traveling through it is mostly done by pedal boats. 

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