The Uyuni salt lake of Tunupa , The Uyuni salt lake of Tunupa ,

covers 12.000 km², covers 12.000 km²,

making it the biggest salt lake in the world.making it the biggest salt lake in the world.

It is located 3.650 metros up in the mountains of Bolivia, It is located 3.650 metros up in the mountains of Bolivia,

and is considered as and is considered as

one of the seven natural marvels of the world.one of the seven natural marvels of the world.

After rain when covered with water After rain when covered with water

the salt lake is converted into the largest mirror in the world.the salt lake is converted into the largest mirror in the world.

http://beautifulplacestovisit.com/large/deserts/Salar-de-Uyuni-Bolivia3.jpg

It is comprised of approximately 11 layers of salt It is comprised of approximately 11 layers of salt

of depths varying from 2 to 10 meters . of depths varying from 2 to 10 meters .

The superficial crust is about 10 meters deep The superficial crust is about 10 meters deep

while the maximum depth of the salt lake is 120 meters. while the maximum depth of the salt lake is 120 meters. The crust is comprised of mushy salt brine when wet.The crust is comprised of mushy salt brine when wet.

The salt lake of Uyuni, is estimated The salt lake of Uyuni, is estimated

to contain 10 thousand million tonnes of salt, to contain 10 thousand million tonnes of salt,

of which they extract 25 thousand tonnes each year.of which they extract 25 thousand tonnes each year.

The traditional extraction method is to make mounds from which the water evaporates before transporting.

These blocks of dry salt are used These blocks of dry salt are used

in construction of hotel buildings on the salt lake.in construction of hotel buildings on the salt lake.