The Aidar (, ) is a river in

Luhansk Oblast Luhansk Oblast (; ), also referred to as Luhanshchyna (), is the easternmost Administrative divisions of Ukraine, oblast (province) of Ukraine. Its administrative center is the city of Luhansk. The oblast was established in 1938 and bore the n ...

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 ...

and

Belgorod Oblast Belgorod Oblast () is a federal subjects of Russia, federal subject (an oblast) of Russia. Its administrative center is the types of inhabited localities in Russia, city of Belgorod. , the population is 1,540,486. History During the Princely ...

Russia Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...

. A left tributary of the Seversky Donets, it is long (with located within Ukraine) and has a basin area of .«Река Айдар (Адар, Айдор)»
Russian State Water Registry The slopes of the valley are partitioned with

ravine A ravine is a landform that is narrower than a canyon and is often the product of streambank erosion. Ravines are typically classified as larger in scale than gullies, although smaller than valleys. Ravines may also be called a cleuch, dell, ...

s and

gorge A canyon (; archaic British English spelling: ''cañon''), gorge or chasm, is a deep cleft between escarpments or cliffs resulting from weathering and the erosion, erosive activity of a river over geologic time scales. Rivers have a natural tend ...

s. In the spring, snow melt accounts for approximately 70% of the flow. The average flow module is 1.7 litres • sec / km². The river freezes in December. The Aidar Battalion in the Ukrainian Armed Forces is named after this river.

References

* М. Т. Янко. Топонімічний словник-довідник української РСР, К., «Радянська школа», 1973, стор. 13 Rivers of Belgorod Oblast Rivers of Luhansk Oblast {{Russia-river-stub