Trans-Alai trăns-älī´, trănz– [key], mountain range, central Asia, a part of the Pamir-Alai mountain system. The Trans-Alai extends 155 mi (249 km) W from China to form the border between Kyrgyzstan and Tajikistan. It rises to 23,382 ft (7,127 m) in Lenin Peak (also called Ibn Sina Peak and Kuh-i-Gamo).

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