_ 134 _ These are the two winds which usually blow over the Red Sear it seldom blows from land, and there are never any contrary-winds, thunderstorms or tempests of any kind. One can navigate there at all times, which is done in small vessels talled gelvas; these are powered by oars, or by sails, if the weather is night for it. From the gates of the strait to the city of Suez, which is situated at the other end, lies a distance of 355 leagues, which is the length of the sea: at its widest, its breadth measures 30 leagues. The Arabs have divided it up into three segmenta for navigation, and into twelve "gemas", which make up three 10 league routes. They make four "gemas", which constitute one route, running along the Arabian Sea to Suez, and passing through all the islands, ridges and reefs on the way: its depth varies from 3 to 12 "arms", and our ship can sail through it during the day if they are careful, but not, during the night. Another four gemas stretch along the Prester's lands up to a port called Qusais (Quseir?),which is situated almost directly to the south of Tono on the Arabian Coast. The other route of four gemas runs along the middle of the sea, which they call, "wide Sea", and whose depth is from 25 to 45 "arms" however, the sea is so narrow that whoever sails through it can see land on both sides. The pilots, or
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