The Uyuni salt marsh is the largest in the entire world. It is a dried up salt lake that sits in the south of the Altiplano Plain. The interior of Uyuni is covered with a thick bed of salt, ranging from 2 to 8 metres thick. When the rainy season begins in Bolivia, the entire surface of the salt marsh is covered with a layer of water and looks like a huge mirror. The plane of the salt marsh is uniquely flat, under several metres of salt crust there is a lake from 2 to 20 metres deep. The salt water of which, according to experts' estimates, contains from 50 to 70% of the world's lithium reserves. The lake also contains a lot of table salt and magnesium chloride. In the very centre of the salt marsh you can see several islands, which in ancient times were the tops of volcanoes. Their structure is unusually fragile and similar to the composition of coral. That is, it consists of algae and fossils. In the area of the Uyuni salt marsh usually always stands bright sunny weather, rains are very rare here. Therefore, the sight of a huge flat salt lake against the background of a vast desert plain and blue cloudless sky always causes a storm of delight and a lot of impressions among tourists.
