Allah, glorified be His name, created this mountain and made it of low elevation on the side of the land of Sudan, and made its other face, which faces the land of Egypt, very high. The Nile flows by its sides and pours from its top with a great and terrifying torrent. And there, where the water pours, are piled stones and scattered rocks, and the water falls between them. When the boats of the Nubians and other boats of the Sudan reach this place from the Nile, they cannot cross it because of the destructive obstacles within it. When the boats, with the merchants and their goods, reach this point, they turn from the boats to the backs of camels and travel to the city of Aswan in the desert. Between this place, meaning the mountain, and Aswan, there are about 11 stages by camel. And this Aswan is one of the frontiers of Nubia, although they are at peace most of the time. Likewise, the boats of Egypt do not ascend the Nile except to the city of Aswan. It is the last of Upper Egypt and it is a small, prosperous city, abundant in wheat and all kinds of grains, fruits, melons, and all legumes. And there is much meat there, of cattle, lambs, goats, and sheep, and other wonderful kinds of meat, excellent in taste and fat. And their prices are cheap throughout the days. And there are trades and goods brought from there to the land of Nubia. And sometimes the well-fed horses of the Sudan raid its nobles. They are called the Bilbiyyin, and they claim to be Romans and to be of the Christian religion from the days of the Copts, before the advent of Islam. However, they are dissenters among the Christians, hostile to them, and they inhabit the area between the land of Beja and the land of Abyssinia, and they are connected to the land of Nubia. They are men who move around and do not settle in one place, unlike what is done in the lands of the Beja.