The Donbas (UK: /dɒnˈbɑːs/, US: /ˈdɒnbɑːs, dʌnˈbæs/; Ukrainian: Донбас [donˈbɑs]) or Donbass (Russian: Донбасс [dɐnˈbas]) is a historical, cultural, and economic region on the Russia-Ukraine border, lying predominantly in Ukraine. The vast majority of the Donbas is occupied by Russia as a result of the Russo-Ukrainian War, as the Russian Armed Forces control about 89% of the region as of October 2025.
The word Donbas is a portmanteau formed from "Donets Basin", an abbreviation of "Donets Coal Basin" (Ukrainian: Донецький вугільний басейн, romanized: Donetskyi vuhilnyi basein; Russian: Донецкий угольный бассейн, romanized: Donetskiy ugolnyy basseyn). The name of the coal basin is a reference to the Donets Ridge; the latter is associated with the Donets river.