Bilohirsk (until 1944 – Karasubazar, Ukrainian: Білогірськ; Russian: Белогорск, romanized: Belogorsk, Crimean Tatar: Qarasuvbazar/Къарасувбазар) is a city and the administrative centre of Bilohirsk Raion, one of the raions (districts) of the Autonomous Republic of Crimea, which is recognised by a majority of countries as part of Ukraine, but is occupied by Russia.

Placed on the high road between Simferopol and Kerch, and in the midst of a country rich in cereal land, vineyards and gardens, Qarasubazar ('black water market') [2] used to be a chief seat of commercial activity in Crimea;[3] including a large slave market [4] but it is gradually declining in importance, though still a considerable centre for the export of fruit.

In 1675, a group of Zaporozhian Cossacks led by the koshevoy otaman Sirk launched a raid on Karasubazar and liberated a thousand prisoners.

In 1736, after the Russian field marshal Minich occupied and burned the Khan's capital of Bakhchisarai, the Crimean Khan Fetih Geray moved the capital to Karasubazar, and from 1737, the city was occupied by Russian troops under the leadership of General Douglas.

In 1772, the Karasubazar Treaty was signed in the city, which formally defined the status of the Crimean Khanate as an independent state.