Circassia (/sɜːrˈkæʃə/ sir-KASH-ə), also known as Zichia, was a country and a historical region in Eastern Europe. It spanned the western coastal portions of the North Caucasus, along the northeastern shore of the Black Sea. Circassia was conquered by the Russian Empire during the Russo-Circassian War (1763–1864), after which approximately 80–97% of the Circassian people were either exiled or massacred in the Circassian genocide.
In the medieval era, Circassia was nominally ruled by an elected Grand Prince, but individual principalities and tribes were autonomous. In the 18th–19th centuries, a central government began to form. The Circassians also dominated the northern end of the Kuban River, but were eventually pushed back to the south of the Kuban after suffering losses to military raids conducted by the Mongol Empire, the Golden Horde, and the Crimean Khanate. Their reduced borders then stretched from the Taman Peninsula to North Ossetia. The term Circassia is also used as the collective name of various Circassian states that were established within historical Circassian territory, such as Zichia.