Piri Reis map

The Piri Reis map is a world map compiled in 1513 from military intelligence by the Ottoman admiral and cartographer Piri Reis (pronounced [piɾi ɾeis]). Approximately one third of the map survives; it shows the western coasts of Europe and North Africa and the coast of Brazil with reasonable accuracy. Various Atlantic islands, including the Azores and Canary Islands, are depicted, as is the mythical island of Antillia and possibly Japan.

The historical importance of the map lies in its demonstration of the extent of European exploration of the New World by approximately 1510, and in its claim to have used Columbus's maps, otherwise lost, as a source. It used ten Arab sources, four Indian maps sourced from the Portuguese, and one map of Columbus. More recently, it has been the focus of pseudohistoric claims for the pre-modern exploration of the Antarctic coast.

The map is the extant western third of a world map drawn on gazelle skin parchment, with dimensions reported as 90 cm × 63 cm, 86 cm × 60 cm, 90 cm × 65 cm, 85 cm × 60 cm, 87 cm × 63 cm, and 86 cm × 62 cm. These discrepancies are largely due to the damaged corner. The surviving portion primarily details the western coast of Africa and the eastern coast of South America. The map was signed by Piri Reis, an Ottoman-Turkish admiral, geographer and cartographer, and dated to the month of Muharram in the Islamic year 919 AH, equivalent to 1513 AD. It was presented to Ottoman Sultan Selim I in 1517. In the map's legend, Piri inscribed that the map was based on about twenty charts and mappae mundi. According to Piri, these maps included eight Ptolemaic maps, an Arabic map of India, four newly drawn Portuguese maps from Sindh, Pakistan and a map by Christopher Columbus of the western lands. From Inscription 6 on the map:

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