The Oskil or Oskol (; ) is a south-flowing river in Russia and Ukraine. It arises roughly between Kursk and Voronezh and flows south to join the Donets which flows southeast to join the Don. It is long, with a drainage basin of . «Река Оскол», Russian State Water Registry
The river has its sources on the Central Russian Upland, and flows through Kursk Oblast and in Russia, and through the eastern part of Kharkiv Oblast in Ukraine, where it joins the Seversky Donets river. An artificial lake, the Oskil Reservoir, was created in 1958 to help with flood protection and as a source of electricity.
There are several towns along the Oskil: Stary Oskol, Novy Oskol and Valuyki in Russia, and Kupiansk, Kupiansk-Vuzlovyi, Kivsharivka, Borova and Dvorichna in Ukraine.
Following the counteroffensive, the frontline stalled along the northeastern sector of the river in Ukraine. However, in late 2024, Russian forces restarted offensive operations in the area, making several attempts to recross the Oskil river. On January 9, 2025, Russian forces successfully established a bridgehead across the Oskil river, southeast of Dvorichna. Following this, Russian forces steadily advanced across the river, eventually capturing Dvorichna, and using their bridgehead as a launch post for advancing onto Kupiansk.
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