The Sulak (, ,
[Lepiev A.S., Lepiev İ.A., Türkçe-Çeçençe sözlük, Turkoyŋ-noxçiyŋ doşam, Ankara, 2003]) drains most of the mountainous interior of
Dagestan
Dagestan ( ; ; ), officially the Republic of Dagestan, is a republic of Russia situated in the North Caucasus of Eastern Europe, along the Caspian Sea. It is located north of the Greater Caucasus, and is a part of the North Caucasian Fede ...
northeast into the
Caspian Sea
The Caspian Sea is the world's largest inland body of water, described as the List of lakes by area, world's largest lake and usually referred to as a full-fledged sea. An endorheic basin, it lies between Europe and Asia: east of the Caucasus, ...
. It and most of its branches flow in canyons. Its main tributaries are, from north to southeast:
*The
Andi Koysu flows north-northeast and joins the Avar Koysu to become the Sulak. A few of its upper tributaries are in Georgia. Near the junction of the two rivers were the
Siege of Akhoulgo and the
Battle of Gimry.
*The Avar Koysu flows northeast to join the Andi Koysu, forming the Sulak. Its upper tributaries are the northeast flowing Khzanor and the northwest flowing Dzhurmut.
*The Kara Koysu flows northeast and joins the Avar Koysu about northwest of Gergebil. North of Gergebil is the Irgan dam and reservoir. Its long upper tributaries include the Karalazuger, Tleyserukh and Risor.
*The Kazikumukh Koysu flows north and joins the Kara Koysu at Gergebil.
North of the Sulak basin is the
Terek basin and south of it is the
Samur
SAMUR (''Servicio de Asistencia Municipal de Urgencia y Rescate'') is a specialized emergency system of Madrid, Spain. It is composed of the central base, 17 operative bases and 190 vehicles.
History
The starting point and deployment of the or ...
basin. To the west is the crest of the
Main Caucasian Range
The Main Caucasian Range; is a mountain range in the Russian Federation, Georgia (country), Georgia and Azerbaijan. It is the dividing range of the Greater Caucasus.
The protected areas of the range are the Teberda Nature Reserve, Kabardino-Bal ...
of the
Caucasus Mountains
The Caucasus Mountains
*
* Azerbaijani: ,
*
*
*
*
*
*
*
*
*
*
* is a mountain range at the intersection of Asia and Europe. Stretching between the Black Sea and the Caspian Sea, they are surrounded by the Caucasus region ...
and to the east are many short rivers that flow down into the Caspian.
The Sulak proper starts at the junction of the Andi and Avar Koysus. It flows northeast into the broad
Chirkey Reservoir. It then flows northwest through the narrow Miatli canyon and reservoir. It reaches flat country at Miatli and leaves the last mountains just south of
Kizilyurt
Kizilyurt (; ; , ''Qızıl-yurt'') is a town in the Republic of Dagestan, Russia, about northwest of Makhachkala. Population: It is located where the north-flowing Sulak River leaves the mountains and enters the Terek-Sulak Lowland.
Etymology ...
and enters the Terek-Sulak Lowland about from its source. Here there are meanders, former channels and canals. It flows northeast about , turns east and reaches the Caspian after about . Its delta is a smaller version of the Terek River delta about north. The lower Sulak supplies water to
Makhachkala
Makhachkala, previously known as Petrovskoye (1844–1857) and Port-Petrovsk (1857–1921), or by the local Kumyk language, Kumyk name of Anji, is the capital and List of cities and towns in Russia by population, largest city of Dagestan, Russia. ...
through a canal.

In 1735 the Sulak River was stipulated as defining the boundary between the
Russian
Russian(s) may refer to:
*Russians (), an ethnic group of the East Slavic peoples, primarily living in Russia and neighboring countries
*A citizen of Russia
*Russian language, the most widely spoken of the Slavic languages
*''The Russians'', a b ...
and the
Persian empires.
References
{{Authority control
Rivers of Dagestan
Tributaries of the Caspian Sea