It is conjectured that at some remote period the Hawash flowed into Tajura Bay and that the present condition of the country is the result of volcanic upheaval.
The Hawash flows through the Aussa country in a N.E.
There is a break in the wall, through which the river Hawash flows eastward.
The main range at this point trends S.W., while south of the Hawash valley, which is some 3000 ft.
Narrow and deep clefts, through which descend mountain torrents to lose themselves in the sandy soil of the coast land, afford means of reaching the plateau, or the easier route through the Hawash valley may be chosen.