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Purportedly, Abubakari II of Mali went exploring "the limits of the ocean" with at least 200 ships of supplies and at least 200 ships of men in 1310, 1311, or 1312. He never came back and the Malinese never reached anything.
There have been several discussions on this site in the past about this fleet discovering the new world.
The only knowledge I have about Abubakari and his fleet comes from Wikipedia, but to me it appears that this story is mostly legendary.