Sung Document
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The Sung Document is a work of a Chinese author circa 1178. It states that Muslim sailors reached a region called "Mu-Lan-Pi", which has been claimed to be some part of the Americas (specifically, present-day California.)
If the document is authentic, then it is one of the earliest records of pre-Columbian trans-oceanic travel from the Eurasian continent to the Americas. However the identification of Mu-Lan-Pi with America is in doubt.