Around the lake Irtyash a lot of old the Demidov's quarries.
This place is a geological references noted the richest deposits of sapphire, a precious stone.
Pits are very old, flooded with water.
Lake Irtyash is one of the largest lakes in the Ural. Its area is such that into him can fit the State of San Marino.Translated from the Bashkir (Bashkirs are the indigenous people of the Urals) Irtyash name means "stony place". And indeed, shores of the lake looks like the rocky cliffs, in the shallows are often large boulders. On the north shore of the lake is the city Casli, south-east - the city of Ozersk, on the southwest coast are Kyshtym outskirts of the city.