It has been already observed, that the Mahometan Moors and Arabs possessed all the low country on the Indian Ocean, and opposite to Arabia Felix; and being, by their religion, obliged to go in pilgrimage to Mecca, as also by their sole profession, which was trade, they became, by consequence, the only carriers and directors of the commerce of Abyssinia. All the country to the east and north of Shoa was possessed and commanded chiefly by Mahometan merchants appointed by the king; and they had established a variety of marts or fairs from Ifat, all the way as far as Adel.

Adel and Mara were two of the most powerful kingdoms which lie on the Indian Ocean; and, being constantly supported by soldiers from Arabia, were the first to withdraw themselves from obedience to the king of Abyssinia, and seldom paid their tribute unless when the prince came to raise it there with an army. Ifat, Fatigar, and Dawaro, were indeed originally Christian provinces; but, in weak reigns, having been ceded to Moorish governors, for sums of money, they, by degrees, renounced both their religion and allegiance.

Travels to Discover the Source of the Nile, Volume II — Part 10

From what has been observed, the reader will conceive, that where it is said the king, from his capital in Shoa, marched down into Dawaro, Hadea, or Adel, that he then descended from the highest mountains down to the flat country on the level with the sea. That this country, from Hadea to Dawaro, having been the seat of war for ages, was, partly by the soldier for the use of the camp, partly by the husbandman for the necessaries of life, cleared of wood, where the water stood constantly in pools throughout the year; and, being all composed of fat black earth, which the torrents bring down from the rainy country of Abyssinia, was sown with millet and different kinds of grain in the driest ground, while, nearer the mountains, they pastured numerous herds of cattle. Notwithstanding, however, the country was possessed of these advantages, the climate was intensely hot, feverish, and unhealthy, and, for the most part, from these circumstances, fatal to strangers, and hated by the Abyssinians.

Travels to Discover the Source of the Nile, Volume II — Part 10

Again, when it is said that the king had marched to Samhar, it is meant that he had passed this fruitful country, and is come to that part of the zone, or belt, (nearest the sea) composed of gravel; which, though it enjoys neither the water nor the fruitfulness of the black earth, is in a great measure free from its attendant diseases, and here the cities and towns are placed, while the crop, oxen, and cattle, are in the cultivated part near the mountains, which in the language of the country is called _Mazaga_, signifying _black mould_.

Travels to Discover the Source of the Nile, Volume II — Part 10