Somathand British 5 ] SURFACE : INTERIOR PLATEAU The northern part of this plateau zone consists of great grazing areas, of which the most important are the Ogo, the northern stretches of the Nogal and Warsangeli plateaux , and the upper part of the Darror valley. All of these, except the last, are fairly well wooded with cedars, euphorbias, acacias of many species, figs, &c. , interspersed with great well watered plains of dihe, daremo, and other grasses . South of these areas, and merging with them , lies the great Haud plain, which extends far to the south, east, and west into Abyssinia and Italian Somaliland.

That part of the Haud which lies within the Protectorate varies in altitude from 2,000 ft . in the south to 4,000 or 5,000 ft . in the north . It is divided by the Nogal valley (which is generally known as the Nogal Plain ) into the Northern , or Sorl, Haud and the Southern Haud, two approximately equal areas. The Nogal valley is a great limestone plain, some hundreds of feet lower in level than the Haud, which it crosses from near Burao to its south east corner . It is watered by the Tug Der coming from the Ogo and by the Tug Darrero coming from the Warsangeli country, which unite to form the Nogal stream. The northern part of the plain forms a swamp in the rains, but furnishes excellent pasture after wards. South of the swamp there is good grazing and some tree vegetation as far as about 47 ° E. , south of which the country is arid and stony. The Northern Haud, comprising the southern parts of the Nogal and Warsangeli plateaux, is little known. It is believed to be an undulating limestone country , about 3,000 ft. in altitude, with many extensive, well watered prairies. The Southern Haud is an undulating country, waterless after the first month of the dry season , but supplying very good grazing during the rains and browsing for camels at all times of the year.