the south of Asia: the Indian Ocean was the Oceanus Orientalis, the Eastern Ocean, as opposed to the Atlantic or Western Ocean, the Oceanus Occidentalis in Behaim's two ocean world. According to George E. Nunn, the key to Waldseemüller's apparent new ocean is found on the three sketch maps made by Bartolomé Colon (that is, Bartholomew Columbus, Christopher's brother) and Alessandro Zorzi in 1504 to demonstrate the geographical concepts of Christopher Columbus. One of the Columbus/Zorzi sketch maps bears an inscription saying that: "According to Marinus of Tyre and Columbus, from Cape St. Vincent to Cattigara is 225 degrees, which is 15 hours; according to Ptolemy as far as Cattigara 180 degrees, which is 12 hours". This shows that Christopher Columbus overestimated the distance eastward between Portugal and Cattigara as being 225 degrees instead of Ptolemy's estimate of 180 degrees, permitting him to believe the distance westward was only 135 degrees and therefore that the land he found was the East Indies. As noted by Nunn, in accordance with this calculation, the Colon/Zorzi maps employ the longitude estimate of Claudius Ptolemy from Cape St. Vincent eastward to Cattigara, but the longitude calculation of Marinus and Columbus is employed for the space between Cape St. Vincent westward to Cattigara. Nunn pointed out that Martin Waldseemüller devised a scheme that showed both the Columbus and the Ptolemy-Behaim concept on the same map. As Waldseemüller himself said: "We have followed Ptolemy on the flat map, except for the new lands". On the right hand side of the Waldseemüller 1507 map is shown the Ptolemy-Behaim concept with the Ptolemy longitudes: this shows the huge peninsula of India Superior extending to the south of the Tropic of Capricorn. On the left side of the Waldseemüller map the discoveries of Columbus, Vespucci and others are represented as a long strip of land extending from about latitude 50 degree North to latitude 40 degrees South. The western coasts of these trans-Atlantic lands discovered under the Spanish crown are simply described by Waldseemüller as Terra Incognita (Unknown Land) or Terra Ulterior Incognita (Unknown Land Beyond), with a conjectural sea to the west, making these lands apparently a distinct continent. America's (that is, South America's) status as a separate island or a part of Asia, specifically, the peninsula of India Superior upon which Cattigara was situated, is left unresolved. As the question of which of the two alternative concepts