Vorotan

The Vorotan River is one of the Longest Rivers in Armenia and is a river in the South Caucasus that runs for 179 kilometers and has a basin size of 5,650 square kilometers. The river begins in the Syunik Province in South Armenia, runs 119 kilometers through Armenia, another 59 kilometers through the Nagorno-Karabakh territory, and eventually empties into the Aras River. The Vorotan River flows through several steep gorges and hilly regions of Armenia, and it contains three reservoirs and an adjacent hydroelectric station built during the Soviet period. The Votoran River is a left tributary of the Aras River.

The river generally runs across steep terrain, forming deep gorges in various locations. Along its path are the cities of Sisian and Qubadli. The river generates a waterfall six kilometers from Sisian, known as the "Shaki Waterfall." Near Tatev Monastery, the river forms a natural landmark known as the "Devil's Bridge." Mineral ponds may be found at the base of the travertine arch.

Three reservoirs that make up the Vorotan Cascade were built during the Soviet era. They provide Armenia with hydroelectric power and agricultural water. To boost the volume of water in Lake Sevan, a 21.6-kilometer (13.4-mile) tunnel was built to convey some of Vorotan's waters to the lake. Work began in the 1980s but was halted in 1988, with just 18 km (11 mi) finished, due to the commencement of the First Nagorno-Karabakh War. In 2003, the Armenian government finished the Vorotan tunnel. A second tunnel, known as the "Arpa–Sevan," was built in 1981. The water from the Arpa River is diverted to Lake Sevan as a result of this project. The water level in the lake has risen as a result of the water flowing through the two tunnels.

Length: 179 km