Lake Sevan is situated in Gegharkunik district. Sevan is one of the three large lakes in the Armenian highland and is one of the most largest lakes whole over the world. The lake surface is at an altitude of 1897m above sea level. Its depth is 80 m, an area-1260km, lengh-70km, width-55km. In summer, the middle temperature of lake surface is 18-23 C. Sevan consists of two unequal parts - Big Sevan and Small Sevan.