The Udai or Udaj () is a

river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...

Ukraine Ukraine is a country in Eastern Europe. It is the List of European countries by area, second-largest country in Europe after Russia, which Russia–Ukraine border, borders it to the east and northeast. Ukraine also borders Belarus to the nor ...

, a

right tributary A tributary, or an ''affluent'', is a stream or river that flows into a larger stream ('' main stem'' or ''"parent"''), river, or a lake. A tributary does not flow directly into a sea or ocean. Tributaries, and the main stem river into which the ...

of the Sula, in the basin of

Dnieper The Dnieper or Dnepr ( ), also called Dnipro ( ), is one of the major transboundary rivers of Europe, rising in the Valdai Hills near Smolensk, Russia, before flowing through Belarus and Ukraine to the Black Sea. Approximately long, with ...

. It is long, and has a

drainage basin A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, ...

of .Удай

Great Soviet Encyclopedia The ''Great Soviet Encyclopedia'' (GSE; , ''BSE'') is one of the largest Russian-language encyclopedias, published in the Soviet Union from 1926 to 1990. After 2002, the encyclopedia's data was partially included into the later ''Great Russian Enc ...

The Udai finds its source near the village of Rozhnivka in

Pryluky Raion Pryluky Raion () is a raion (district) of Chernihiv Oblast, northern Ukraine. Its administrative centre is located at the city of Pryluky. Population: On 18 July 2020, as part of the administrative reform of Ukraine, the number of raions of Ch ...

Chernihiv Oblast Chernihiv Oblast (), also referred to as Chernihivshchyna (), is an administrative divisions of Ukraine, oblast (province) in northern Ukraine. The capital city, administrative center of the oblast is the city of Chernihiv. There are 1,511 sett ...

. The river flows through the Dnieper Lowland, within the Chernihiv Oblast and the

Poltava Oblast Poltava Oblast (), also referred to as Poltavshchyna (), is an administrative divisions of Ukraine, oblast (province) of central Ukraine. The capital city, administrative center of the oblast is the city of Poltava. Most of its territory was par ...

. It is predominantly fed by melting snow ( nival regime). It freezes between November and early January, and it stays under the ice until March to mid April. The average discharge of the Uday at 39 km from the mouth is . The towns of

Pryluky Pryluky ( ) is a city and List of hromadas of Ukraine, municipality located on the Udai River in Chernihiv Oblast, north-central Ukraine. It serves as the administrative center of Pryluky Raion (Raion, district). Located nearby is the Pryluky (a ...

and Pyriatyn lie on the Udai, as well as the urban-type settlements of

Dihtiari Dihtiari (; ) is a rural settlement in Pryluky Raion, Chernihiv Oblast, northern Ukraine. It is located on the left bank of the Udai in the drainage basin A drainage basin is an area of land in which all flowing surface water converges to a ...

, Varva, Ladan, and the village(selo) of Pisky-Udajsjki.

Tributaries

*Left: Burymnya, Ichenka, Radkivka, Smosh, Utka, Lysohir, Varva, Zhuravka, Mnoha. *Right: Halka, Yushchenkova, Stavka, Perevid, Vilshanka.

References

*Geographical Encyclopedia of Ukraine: 3 t. / Editorial Board: O. M. Marinych (repl. Ed.) And others. - K.: "Ukrainian Soviet Encyclopedia" by them. M.P. Bazhana, 1989. *Encyclopedia of Ukrainian Studies: Dictionary part: n 11 vols/ Scientific society named after Shevchenko; Goal. Ed. Prof. Dr. Volodymyr Kubiyovych. - Paris; New York: Young Life; Lviv; Kyiv: Globus, 1955–2003. *Hydrochemistry of the rivers of the Left Bank forest-steppe / Ed. VK Khilchevsky, VA Stashuk. - K .: Nika-Center, 2014. - 230 p. *Lozovitsky P.S. Environmental assessment of the quality of the water of the upper Uday as a basis for the organization of monitoring of the ecosystems of the national natural parks of the basin

ext Ext, ext or EXT may refer to: * Ext functor, used in the mathematical field of homological algebra * Ext (JavaScript library), a programming library used to build interactive web applications * Exeter Airport Exeter Airport , formerly ''Ex ...

/ P.S. Lozovitsky / / Protected case 2016. - No. 1 (22). - with. 21-35 *Priluki.info {{Ukraine-river-stub Rivers of Chernihiv Oblast Rivers of Poltava Oblast