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Sevan ), is Armenia's largest lake, the largest lake in Transcaucasia and one of the largest high altitude lakes in the world. The entire lake is situated inside the eastern Armenian province of Geghark'unik'. It is fed by 28 rivers and drained by the Hrazdan (Razdan) river. Only 10% of the outgoing water is drained by the Hrazdan, while the remaining 90% evaporates. Along with lake Van and lake Urmia it was one of the three great lakes of the Armenian Kingdom, referred to as the i

In 1910 Soukias Manasserian (one of the civil engineers behind the interventions that caused the Aral Sea disaster) published a study i, suggesting to lower the lake to 45 metres and use the water for irrigation and hydroelectricity.

In the Stalin era the plan was slightly modified: the water level would be reduced by 55 metres (5 metres more than suggested by Manasserian), the perimeter would shrink to 80 km and the volume to only 5 kmsup. Nut and oak trees would be planted on newly acquired land, and introducing some trout species into the remainder of the lake would increase fishery production by ten times.

The Armenian Supreme Soviet approved the plan without consulting the local people and the major works started in 1933. The river bed of the Hrazdan was deepened and construction of a tunnel 40 metres below the original water level started. The work was delayed due to World War 2 and was only finished in 1949 when the water level began to fall by more than one metre per year.

An ecological disaster like that in Aral Sea was avoided when the Stalinist era ended in 1956 and the project and its consequences were reviewed thoroughly. As there were troubles with planting oaks and nuts and with fishery, the i was established with the mission "to raise the level as much as possible". Hydro-electric power stations on the Hrazdan would be replaced with thermal power stations. In 1962 the level stabilised at 18 metres below the original level, but two years later the lake started to "bloom" due to eutrophic algae.

In 1981, a 49 km tunnel was constructed, diverting water from the Arpa river (from a reservoir near Kechut) to the lake near Artsvanist. The level rose only 1.5 metres, so another 22 km tunnel was begun from Vorotan (further south from Kechut). Only 18 km were constructed because in 1988 Azerbaijan imposed an economic blockade on Armenia due to the Nagorno-Karabakh conflict and the work had to be stopped.

The Armenian government completed the Vorotan tunnel in 2003, but water has not yet begun to flow into the lake. The level stabilised at 20 metres below the original, and the lake's area is now 940 kmsup.

Due to recent rain and other changes, the water level is again slowly rising (as of 2005).

) was an endemic species of the lake, but it is endangered as some competitors were introduced into the lake, including common whitefish (i). If the Sevan trout is likely to become extinct in its "home" lake, it seems that it will survive in Issyk-Kul lake (Kyrgyzstan) where it was introduced.

There are numerous beaches along the entire lake shore. The most famous cultural monument is the Sevanavank monastery near the town of Sevan at the northwestern shore. Initially the monastery was located on an island, but the fall of the water level turned it into a peninsula. Another monastery at the western shore is Hayrivank, and further south, near Noratus, there is a is. When the water level fell, many archaeological artifacts were found, dated to 2000 years of age and older (some as old as the early Bronze Age). Most of them are now displayed in Yerevan.

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