Irpin’ often called Irpen’ as its name is pronounced in Russian, is a river in Ukraine

Ukraine

Ukraine is a country in Eastern Europe. It has an area of 603,628 km², making it the second largest contiguous country on the European continent, after Russia...

, a right tributary of the Dnieper.

It is 162 km in length and flows through the city of Irpin'. The location where Irpin' enters the Dnieper river falls into the Kiev Reservoir

Kiev Reservoir

The Kiev Reservoir , locally the Kiev Sea, is a large water reservoir located on the Dnieper River in Ukraine. Named after the city of Kiev, which lies to the south, it covers a total area of 922 square kilometres within the Kiev Oblast. The reservoir was formed in 1960-1966, as a result of the...

 which the Dnieper forms because of the Kiev

Kiev

Kiev or Kyiv is the capital and the largest city of Ukraine, located in the north central part of the country on the Dnieper River. The population as of the 2001 census was 2,611,300. However, higher numbers have been cited in the press....

 Hydro-Electric Power Plant dam

Dam

A dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. Hydropower and pumped-storage hydroelectricity are...

. Thus, the Dnieper water level at this location is lifted artificially by about 6.5–7 meters above the natural level. Therefore, the water of Irpin' is pumped into the Kiev Reservoir by powerful electrical pumps, making Irpin' the river that literally flows upwards.

The lands around Irpen' were the heartland of Kievan Rus and the
chronicle

Chronicle

Generally a chronicle is a historical account of facts and events ranged in chronological order, as in a time line. Typically, equal weight is given for historically important events and local events, the purpose being the recording of events that occurred, seen from the perspective of the...

s mention the river in connection with several important historic events, such as the Battle on the Irpen' River

Battle on the Irpen' River

The Battle on the Irpin River occurred in early 1320s between the armies of Gediminas, the Grand Duke of Lithuania, and Prince Stanislav of Kiev, allied with Oleg of Pereyaslavl' and Roman of Bryansk. On the small Irpin River about south west of Kiev, Gediminas resoundingly defeated Stanislav and...

 of 1321 in which the Grand Duke of Lithuania Gediminas (Gedemin) gained control over the lands of what is now central Ukraine.