Lopan River
The Loppan' River is a river
A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 that rises in Belgorod Oblast
Belgorod Oblast
Belgorod Oblast is a federal subjects of Russia . Its administrative center is the city of Belgorod. Population: 1,532,670 .-History:...

 of Russia
Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

 and flows across the Russian-Ukrainian border into Kharkiv Oblast
Kharkiv Oblast
Kharkiv Oblast is an oblast in eastern Ukraine. The oblast borders Russia to the north, Luhansk Oblast to the east, Donetsk Oblast to the south-east, Dnipropetrovsk Oblast to the south-west, Poltava Oblast to the west and Sumy Oblast to the north-west...

 where it joins the Udy River
Udy River
The Uda or Udy River is a river that rises in Belgorod Oblast of Russia and runs through Kharkiv Oblast of Ukraine before entering the Seversky Donets near Chuguyev. Its length is 164 km. The drainage basin occupies 3890 km2. The second largest city of Ukraine, Kharkiv, stands at the confluence of...

 in Kharkiv
Kharkiv or Kharkov is the second-largest city in Ukraine.The city was founded in 1654 and was a major centre of Ukrainian culture in the Russian Empire. Kharkiv became the first city in Ukraine where the Ukrainian Soviet Socialist Republic was proclaimed in December 1917 and Soviet government was...

. The river is 93 km long. The Kharkiv River
Kharkiv River
Kharkiv or Kharkov is a river in Kharkiv Oblast, Ukraine, a left tributary of the Lopan River. It originates from town of Oktyabrsky in Belgorod Oblast, Russia.-See also:...

is one of its tributaries.
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