On 2769 above the sea, there is a crater lake of Ijen volcano on java island is the largest acid lake in the world. The lake's shore is a natural deposit of sulfur, which is extracted here for more than 700 years. 
The lake is really huge: its area is about 1000 x 600 meters with 200 meters depth. Under the lake there is volcano magma – that is called lava when it comes to the surface. As the lake is very deep with dense water, magma remains locked at the bottom.

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