_The Seboo_ is the largest river in West Barbary; it rises in a piece of water situated in the midst of a forest, near the foot of Atlas, eastward of the cities of Fas and Mequinas, and winding through the plains, passes within six miles of Fas. Another stream, proceeding from the south of Fas, passes through the city, and discharges itself into this river: this stream is of so much value to the Fasees, from supplying the town with water, that it is called (Wed el Juhor) the river of pearls. Some auxiliary streams proceeding from the territory of Tezza fall into the Seboo in Liali (the period before mentioned). This river is impassable except in boats, or on rafts. At Meheduma, or Mamora, where it enters the ocean, it is a large, deep, and navigable stream; but the port being evacuated, foreign commerce is annihilated, and little shipping has been admitted since the Portugueze quitted the place. This river abounds more than any other in that rich and delicate fish called shebbel. If there were any encouragement to industry in this country, corn might be conveyed up the Seboo to Fas at a very low charge, whereas it is now transported to that populous city on camels, the expense of the hire of which often exceeds the original cost of the grain. _The Bu Regreg._—This river rises in one of the mountains of Atlas, and proceeding through the woods and valleys of the territory of Fas, traverses the plains of the province of Beni Hassen, and discharges itself into the ocean between the towns of Salée and Rabat, the former being on the northern, the latter on the southern bank: here some of the Emperor’s sloops of war, which are denominated by his subjects frigates, are laid up for the winter. This river is never fordable, but ferries are constantly passing to and fro. _The Morbeya_ also rises in the Atlas mountains, and dividing the territory of Fas from the province of Tedla, passes through a part of Shawia, and afterwards separates that province and Temsena from Duquella; dividing that part of the empire west of Atlas into two divisions. There was a bridge over this river at a short distance from the pass called Bulawan, built by Muley Bel Hassen, a prince of the Mareen family; at this pass the river is crossed on rafts of rushes and reeds, and on others consisting of inflated goat skins. Westward of this pass, the river meanders through the plains, and enters the ocean at the port of Azamor. The Morbeya abounds in the fish called shebbel, the season for which is in the spring. This river not being at any time fordable, horses and travellers, together with their baggage, are transported across by ferries.