If the normal portolano is indeed derived from the lost atlas of Marinus of Tyre, then it follows that other high-quality maps of regions much furthe… - Graham Hancock

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If the normal portolano is indeed derived from the lost atlas of Marinus of Tyre, then it follows that other high-quality maps of regions much further afield than the Mediterranean and the Black Sea, and indeed a world map, might also have been preserved by the Arabs — for we know from Ptolemy's testimony that other Marinus maps, including a world map, did once exist. It will therefore do no harm to keep an open mind to the possibility that the portolan world maps that began to appear during the century after the Carta Pisane, might also have been influenced by earlier 'Tyrian sea-fish' maps of Phoenician origin. Christopher Columbus, whose passionate belief in lands across the Atlantic lead to his 'discovery' of the New World, seems to hint at a Phoenician connection when he describes one of the inspirations for his journey:
'Aristotle in his book On Marvellous Things reports a story that some Carthaginian merchants sailed over the Ocean Sea to a very fertile island ... this island some Portuguese showed me on their charts under the name Antilia.'
Antilia first appears on a portolan chart of 1424. It is a mysterious presence there, a riddle.