On the riverbanks of the Yellow River, the next clue is carved into stone. It reads: "Traverse these mountains in Southern Russia, as we did in 1223." To what mountain range is the clue referring?

Separating the Caspian and Black Seas, on the convergence of Europe and Asia, the Caucasus have long played an important role in history, including in the history of the Mongols. Traveling through Armenia, Azerbaijan, Georgia, and Russia, the mountain range is broken into the northern Greater Caucasus and the southern Lesser Caucasus.

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