. The earth and its inhabitants ... Geography. 134 NORTH-EAST AEEICA, Fi-. -Lakes of East Abyssinia. Scale 1 : 1,500,000. reddish clay. E,ed is the normal colour of the Abyssinian rocks, the very veins of quartz being often of a pink hue, caused by the oxide of iron. According to Heuglin, at least one of the craters, from which were formerly ejected the Hamasen lavas, has been perfectly preserved. Rising midway between Keren and Adua to a height of about 400 feet, it is stated to present the appearance of a crater but recently extinct, although Rohlfs, follow- ing the same route, failed t
. The earth and its inhabitants ... Geography. 134 NORTH-EAST AEEICA, Fi-. -Lakes of East Abyssinia. Scale 1 : 1,500,000. reddish clay. E,ed is the normal colour of the Abyssinian rocks, the very veins of quartz being often of a pink hue, caused by the oxide of iron. According to Heuglin, at least one of the craters, from which were formerly ejected the Hamasen lavas, has been perfectly preserved. Rising midway between Keren and Adua to a height of about 400 feet, it is stated to present the appearance of a crater but recently extinct, although Rohlfs, follow- ing the same route, failed to discover it. To the south, on the eastern edge of the plateau, rise the isolated cones of other volcanoes. Some of the Tigré crests are veritable mountains, not merely in absolute altitude, but also in their eleva- tion relative to the surrounding plains. Thus east of Adua, the cleft cone of Sema- yata attains a height of 10,306 feet, or over 3,000 feet above the town occupying a depression of the plateau at its base. Eastwards, near the outer ledge of the uplands, are other lofty hills, one of which, Aleqwa, rises to a height of 11,250 feet. To the west, between the Mareb and Tak- kazeh, the plateau gradually falls, the relative heights of the mountains dimin- ishing in proportion. The loftiest headland of northern Abyssinia is separated from Tigré in the north and east by the semicircular gorge of the Takkazeh, while the affluents of this great river encircle the plateau on the south-west, thus isolating the Simen (Samen, Semen, Semien, or Semieneh), that is the " northern " or " cold ; The mean height of its escarpments ex- ceeds 10,000 feet, whilst the surrounding valleys of the Balagas to the south and of the Takkazeh to the north, are respectively 5,000 and 6,000 feet lower. Hence the waters flowing from the snowy Simen uplands have a very rapid course, in many places broken by cascades. One of these cataracts Heuglin describes as falling so
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