4. A guard of cherubim, too, that is, of angels, is set over the burning of the fiery rampart to ward off evil spirits, in order that the flames may keep men off, and good angels, bad ones, that the approach to Paradise may not be open to any flesh or to the spirit of wickedness. 5. India is so called from the river Indus, by which it is bounded on the west. It stretches from the southern sea all the way to the sun-rise, and from the north all the way to Mount Caucasus, having many peoples and cities and the island of Taprobana, full of elephants, and Chryse and Argyra, rich in gold and silver, and Tyle, which never lacks leaves on its trees. Chapter 4. On Europe. 2. Europe, which was parted off to form a third part of the circle, begins at the river Tanais, passing to the west along the Northern ocean as far as the limits of Spain. Its Eastern and Southern parts begin at the Pontus, extend along the whole Mare Magnum, and end at the island of Gades. Chapter 5. On Libya (Africa). 3. It begins at the boundaries of Egypt,[350] extending along the South through Ethiopia as far as Mt. Atlas. On the north it is bounded by the Mediterranean Sea, and it ends at the strait of Gades, having the provinces Libya Cyrenensis, Pentapolis, Tripolis, Byzacium, Carthago, Numidia, Mauritania Stifensis, Mauritania Tingitana, and in the neighborhood of the sun’s heat, Ethiopia. [350] Egypt is regarded as part of Asia. 14, 3, 27–28. 14. Ethiopia is so called from the color of its people, who are scorched by the nearness of the sun. The color of the people betrays the sun’s intensity, for there is never-ending heat here. Whatever there is of Ethiopia is under the south pole. Towards the west it is mountainous, sandy in the middle, and toward the eastern region, a desert. Its situation extends from the Atlas Mts. on the west to the bounds of Egypt on the east. It is bounded on the south by the ocean, on the north by the river Nile. It has many peoples, of diverse appearance and fear-inspiring because of their monstrous aspect. 17. Besides the three parts of the circle there is a fourth part across the Ocean on the South,[351] which is unknown to us on account of the heat of the sun, in whose boundaries, according to story, the Antipodes are said to dwell. [351] Extra tres autem partes orbis, quarta pars trans Oceanum interior est in Meridie. Chapter 6. On Islands. 2. Britannia, an island of the Ocean, completely separated from the circle of lands by the sea that flows between, is called by the name of its people. It lies in the rear of the Gauls and looks toward Spain. Its circuit is 4,875 miles; there are many large rivers in it and hot springs, and an abundant and varied supply of metals. Jet is very common there, and pearls.