The Chonhar Strait or Chongar Strait[1] (Ukrainian: Чонгарська протока; Russian: Чонгарский пролив; Crimean Tatar: Çonğar boğazı) is a short, shallow, narrow strait in Ukraine, separating the eastern and western portions of the Syvash, the shallow lagoon system separating Crimea from the mainland east of the Isthmus of Perekop.

One carries the Ukrainian M18 highway, which is part of European route E105 running from northern Norway to Yalta.

[citation needed] During the Russian Civil War, the Chonhar Strait was one avenue of attack during the Perekop-Chongar Operation in November 1920 and was crossed by the Soviet 30th Rifle Division.

The operation resulted in the Soviet capture of Crimea and forced the final evacuation of Pyotr Wrangel's White Army and the end of the Civil War in the south.

[3] Between 2014 and 2022, the Chonhar Strait formed part of the de facto border between mainland Ukraine and the Russian-annexed Crimean peninsula, and was militarized.