"The River Indus, which issues out of Paradise," writes the mythical king, "flows among the plains, through a certain province, and it expands, embracing the whole province with its various windings: there are found emeralds, sapphires, carbuncles, topazes, chrysolites, onyx, beryl, sardius, and many other precious stones. There too grows the plant called Asbetos." A wonderful fountain, moreover, breaks out at the roots of Olympus, a mountain in Prester John's domain, and "from hour to hour, and day by day, the taste of this fountain varies; and its source is hardly three days' journey from Paradise, from which Adam was expelled. If any man drinks thrice of this spring, he will from that day feel no infirmity, and he will, as long as he lives, appear of the age of thirty." This Olympus is a corruption of Alumbo, which is no other than Columbo in Ceylon, as is abundantly evident from Sir John Mandeville's Travels; though this important fountain has escaped the observation of Sir Emmerson Tennant. "Toward the heed of that forest (he writes) is the cytee of Polombe, and above the cytee is a great mountayne, also clept Polombe. And of that mount, the Cytee hathe his name. And at the foot of that Mount is a fayr welle and a gret, that hathe odour and savour of all spices; and at every hour of the day, he chaungethe his odour and his savour dyversely. And whoso drynkethe 3 times fasting of that watre of that welle, he is hool of alle maner sykenesse, that he hathe. And thei that duellen there and drynken often of that welle, thei nevere han sykenesse, and thei semen alle weys yonge. I have dronken there of 3 of 4 sithes; and zit, methinkethe, I fare the better. Some men clepen it the Welle of Youthe: for thei that often drynken thereat, semen alle weys yongly, and lyven withouten sykenesse. And men seyn, that that welle comethe out of Paradys: and therefore it is so vertuous." Gautier de Metz, in his poem on the "Image du Monde," written in the thirteenth century, places the terrestrial Paradise in an unapproachable region of Asia, surrounded by flames, and having an armed angel to guard the only gate.