Озеро Морской Глаз
Lake "Sea Eye" is located in the Republic of Mari El (Russia) near the village of Shariboksad of the Volga area. The lake was formed as a result of a karst fracture 20 thousand years ago. It is interesting by the location on a mountain slope, a deep water at the small sizes and unusual green color of water. The origin of the lake is connected with underground emptiness.