I followed the banks of the Atbara to the junction of the Settite or Taccazy river; I then followed the latter grand stream into the Abyssinian mountains in the Base country. From thence I crossed over to the rivers Salaam and Angrab, at the foot of the magnificent range of mountains from which they flow direct into the Atbara. Having explored those rivers, I passed through an extensive and beautiful tract of country forming a portion of Abyssinia on the south bank of the river Salaam; and again crossing the Atbara, I arrived at the frontier town of Gellabat, known by Bruce as "Ras el Feel." Marching due west from that point I arrived at the river Rahad, in about lat. 12 degrees 30 minutes; descending its banks I crossed over a narrow strip of country to the west, arriving at the river Dinder, and following these streams to their junction with the Blue Nile, I descended that grand river to Khartoum, having been exactly twelve months from the day I had left Berber. The whole of the above-mentioned rivers--i.e. the Atbara, Settite, Salaam, Angrab, Rahad, Dinder, and Blue Nile--are the great drains of Abyssinia, all having a uniform course from southeast to northwest, and meeting the main Nile in two mouths; by the Blue Nile at Khartoum, 15 degrees 30 minutes, and by the Atbara, in lat. 17 degrees 37 minutes. The Blue Nile during the dry season is so reduced that there is not sufficient water for the small vessels engaged in transporting produce from Sennaar to Khartoum; at that time the water is beautifully clear, and, reflecting the cloudless sky, its colour has given it the well-known name of Bahr el Azrak, or Blue River. No water is more delicious than that of the Blue Nile; in great contrast to that of the White river, which is never clear, and has a disagreeable taste of vegetation. This difference in the quality of the waters is a distinguishing characteristic of the two rivers: the one, the Blue Nile, is a rapid mountain stream, rising and falling with great rapidity; the other is of lake origin, flowing through vast marshes. The course of the Blue Nile is through fertile soil; thus there is a trifling loss by absorption, and during the heavy rains a vast amount of earthy matter of a red colour is contributed by its waters to the general fertilizing deposit of the Nile in Lower Egypt.