Assertion: lake's mile | /r/HasProperty | 31,722 square km
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Source sentences:
text: Surface area: 12,248 square miles (31,722 square km), according to Smithsonian magazine.
text: While Lake Baikal is extremely deep, its surface area is only about 12,248 square miles (31,722 square kilometers), putting it in seventh place worldwide in terms of surface area.