The lake lies at an altitude of 1942 metres (6372 feet) above the sea-level. Its length from the mouth of the Magetsch to the outlet of the Blue Nile is approximately forty-five miles, and its breadth on the twelfth parallel of longitude is about thirty-seven miles. The map published in this volume is mainly reproduced from that prepared by Dr. Stecker for the African Association of Germany. How painstaking he was in collecting information may be inferred from the fact that during his excursions in the native boats he took three hundred soundings—an example of patient research which those will best appreciate who have seen a “boat” of the kind. Dr. Stecker gave the following results of his survey:—“Lake Tsana covers a superficial area of 2980 square kilometres. All the islands together possess a superficial area of about fifty square kilometres, of which forty are included in Dek, and four in Dega. I found the greatest depth between the island of Dega and Zegi, viz. seventy-two metres, while the deepest sounding between Korata and Zegi was sixty-seven metres. Between Dek and Adina the depth ranged between thirty-two and forty-seven metres. But I am fully convinced that the deepest places—in my opinion having a much greater depth than one hundred metres—are to be found north of Dek in the direction of Dega and Gorgora. One cannot, however, well venture to make an excursion to those parts in the fragile Abyssinian craft.”[43] This beautiful lake is everywhere girt by mountains, and in some places they rise directly from its shore. As a consequence it is exposed to sudden gusts and squalls that sweep down the valleys and ravines, and these would make navigation risky for small sailing boats. Hippopotami swarm in the waters. The Abyssinians hereabouts—Christians and Mussulmans alike—regard their flesh as unclean; but the hippos do not “lead a very snug life,” as Dr. Stecker supposed. They are constantly harassed by the natives, who shoot them for the sake of their hides. From these are made the whips called _coorbatch_, which are in general demand and are much valued. Plowden wrote that “the crocodile, that is found in most of the large rivers of Abyssinia, does not infest this lake.”[44] So far as my personal observation goes, he was right. But, knowing the enterprising character of the Blue Nile crocodile, I should think it wise to verify the statement, while on the spot, by careful observation.[45] I did not hear of the “Deputy’s” peaceful departure immediately on arriving at the lakeside, for neither of my comrades was in view. After a few minutes I saw one strolling towards me carrying a wild goose, which he had just shot with a rifle, and then the other appeared, coming from the opposite direction, with a brace of wild duck. It was clear that the lake country was well stocked, and that the expedition would fare sumptuously if it were not cut up.