The map is the extant western third of a world map drawn on gazelle skin parchment, with dimensions variously 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, and a map by Christopher Columbus of the western lands. From Inscription 6 on the map: