The most important of these rivers are the following:--the Kurnib or Eastern Khabour, which joins the Tigris in lat. 37° 12’; the Greater Zab (Zab Ala), which washes the ruins of Nimrud, and enters the main stream almost exactly in lat. 30°; the Lesser Zab (Zab Asfal), which effects its junction about lat. 35° 15’; the Adhem, which is received a little below Samarah, about lat. 34°; and the Diyaleh, which now joins below Baghdad, but from which branches have sometimes entered the Tigris a very little below the mouth of the Adhem. Of these streams the most northern, the Khabour, runs chiefly in an untraversed country--the district between Julamerik and the Tigris. It rises a little west of Julamerik in one of the highest mountain districts of Kurdistan, and runs with a general south-westerly course to its junction with another large branch, which reaches it from the district immediately west of Amadiyeh; it then flows due west, or a little north of west, to Zakko, and, bending to the north after passing that place, flows once more in a south-westerly direction until it reaches the Tigris. The direct distance from its source to its embouchure is about 80 miles; but that distance is more than doubled by its windings. It is a stream of considerable size, broad and rapid; at many seasons not fordable at all, and always forded with difficulty. The Greater Zab is the most important of all the tributaries of the Tigris. It rises near Konia, in the district of Karasu, about lat. 32° 20’, long. 44° 30’, a little west of the watershed which divides the basins of Lakes Van and Urymiyeh. Its general course for the first 150 miles is S.S.W., after which for 25 or 30 miles it runs almost due south through the country of the Tiyari. Near Amadiyeh it makes a sudden turn, and flows S.E. or S.S.E. to its junction with the Rowandiz branch whence, finally, it resumes its old direction, and runs south-west past the Nimrud ruins into the Tigris. Its entire course, exclusive of small windings, is above 350 miles, and of these nearly 100 are across the plain country, which it enters soon after receiving the Rowandiz stream. Like the Khabour, it is fordable at certain places and during the summer season; but even then the water reaches above the bellies of horses. It is 20 yards wide a little above its junction with the main steam. On account of its strength and rapidity the Arabs sometimes call it the “Mad River.”