was lacking. That practice differed from the official Portuguese and Spanish cartographers, who omitted from their maps all unexplored coastlines. The second century Alexandrian geographer Claudius Ptolemy had believed that the known world extended over 180 degrees of longitude from the prime meridian of the Fortunate Isles (possibly the Canary Islands) to the city of Cattigara in southeastern Asia. (In fact, the difference in longitude between the Canaries, at 16°W, and Cattigara, at 105°E, is just 121°.) He had also thought that the Indian Ocean was completely surrounded by land. Marco Polo demonstrated that an ocean lay east of Asia and was connected with the Indian Ocean. Hence, on the globe made by Martin Behaim in 1492, which combined the geography of Ptolemy with that of Marco Polo, the Indian Ocean was shown as merging with the Western Ocean to the east. Ptolemy's lands to the east of the Indian Ocean, however, were retained in the form of a great promontory projecting far south from the southeastern corner of Asia—the peninsula of Upper India (India Superior) upon which the city of Cattigara was situated. Another result of Marco Polo's travels was also shown on Behaim's globe—the addition of 60 degrees to the longitude of Asia. Columbus had not actually seen Behaim's globe in 1492 (which apparently owed much to the ideas of Paolo dal Pozzo Toscanelli); but the globe, except for one important point, reflects the geographical theory on which he apparently based his plan for his first voyage. The exception is that Columbus shortened the length of the degree, thus reducing the distance from the Canaries to Zipangu (Japan), to about 62 degrees or only 775 leagues. Consequently, it seemed to Columbus a relatively simple matter to reach Asia by sailing west. In the early 16th century, two theories prevailed with regard to America (the present South America). According to one theory, that continent was identified with the southeastern promontory of Asia that figures on Behaim's globe, India Superior or the Cape of Cattigara. The other view was that America (South America) was a huge island wholly unconnected with Asia. Balboa called the Pacific the Mar del Sur and referred to it as "la otra mar", the other sea, by contrast with the Atlantic, evidently with Behaim's concept of only two oceans in mind. The Mar del Sur, the South Sea, was the part of the Indian Ocean to