"It is located on the great river Itil, which is one of the greatest rivers in the world; in winter it freezes, and people ride on it by sleigh."
"We stopped in this city during a severe cold, and the river froze so that caravans passed through it."
Ibn Battuta. The journey of Ibn Battuta. Translated from Arabic, intro. art. and notes by I. Y. Krachkovsky. — M.: Nauka, 1988.