What tiger subspecies, once found from Turkey to China, went extinct in the 1970s?

The tiger subspecies once found from Turkey to China that disappeared in the 1970s was the Caspian tiger. It occupied a vast range across eastern Turkey, the Caucasus, Central Asia, northern Afghanistan, and western China.

Caspian tigers usually lived in river corridors, wetlands, reed beds, and sparse forests rather than dense tropical jungle. Their range included the shores and drainage basins around the Caspian Sea, as well as the Amu Darya, Syr Darya, and Ili rivers. They were also known by regional names such as the Turanian, Hyrcanian, and Balkhash tiger.

The population declined through habitat conversion, prey loss, and deliberate hunting during agricultural expansion and colonization in Central Asia. The last confirmed records came from different parts of the former range at different times, with tigers disappearing from many areas earlier than the 1970s. Some later reports were unconfirmed. Genetic studies have found the Caspian tiger closely related to the Siberian tiger, prompting proposals that the two populations could be treated as one conservation unit.