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The Amazing Jellyfish Lakes Of Palau, Micronesia
 
There are six Jellyfish Lakes in the island state of Palau in Micronesia.  However, only two are opened to the public.  The Jellyfish Lakes are the amazing result of thousands of years of evolution.  They are unique and not found anywhere else in the world.  The Jellyfish Lakes are cut off from the ocean.  In an environment where there are fews natural predators, the jellyfishes strive in large numbers.  After milleniums of evolution, these venomous predatory sea creatures turned into harmless farmers.  They now feed on algae in the water.  As a result, the jellyfishes lost their stings.  So you can actually swim safely through an amazing thick soup of jellyfishes.
 
Ongeim'l Tketau is one the two jellyfish lakes that are opened to the public.  It is a salt water lake.  Although the lake is separated from teh sea, there are still some underwater holes at the edge of the lake that allowed some exchange of sea water with the lake water.  Getting to Ongeim'l Tketau involves a 10 minutes hike through the jungle but the effort is well worth it.  You can only snorkel here.  Scuba diving is not allowed in the lake because the air bubbles from the scuba gears could tear up the delicate jellyfishes' bodies.  Another reason is that deep diving is not permitted as there is a high concentration of toxic hydrogen peroxide at depths below 30 feet (10 metres) in the lake. 
 
It is quite easy to the jellyfishes in the lake - just go where the sun shines, as the jellyfished move with the sunlight.  Basically, the farmer jellyfishes need bring the algae to sunlight.  The jellyfishes host an interesting species of algae on their bodies. The algae is not eaten by the jellyfishes, instead they provide food to the jellyfishes. The algae create food through the process of photosynthesis, using energy from the sunlight. Swimming with the jellyfishes in the amazing Jellyfish Lakes of Palau is certainly one of the must-do for an avid diver.