It is one of the larger rivers of the country, flowing into the Caspian Sea in southeastern Azerbaijan.

[1][2] The Vilesh is a part of Gizil-Agach State Reserve, an ecological haven for migratory birds, created in 1929.

The river is considered to be one of the wildest bodies of water in the country, flooding the nearby villages during the rainy season.

The river has a tendency to overflow from October to May every year due to heavy rainfall.

The reservoir's volume is forty-six million cubic metres (1.6×109 cu ft) that makes the riverside locations in Masally a major attraction for tourists and therefore becoming a place of many hotels and resorts.