You discover your next clue in the 799th burial site that you visit. It reads: "The tribal leaders of the steppe fought south of this lake, where you'll find it near the bottom." You know the tribes fought just south of the world's deepest lake, which is?

Genghis Khan rose to power at the beginning of the 13th century. But he was just one of many tribal heads who were clawing their way to the top. They fought to rule the area just south of the world's deepest lake, Lake Baikal, which is 5,387 feet at its deepest.

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