The Mongol army under Genghis Khan, generals and his sons crossed the Tien Shan mountains by entering the area controlled by the Khwarezmian Empire.
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Definition of khwarezmian empire in English English dictionary
The Khwarazmian dynasty (also known as the Khwarezmid dynasty, dynasty of Khwarazm Shahs, and other spelling variants; from Persian خوارزمشاهیان Khwārazmshāhiyān, "Kings of Khwarezmia") was a Persianate Sunni Muslim dynasty of Turkic mamluk origin