On the eastern side of the river, on the other hand, there are several important tributaries descending from the Persian mountains: the Khabur, a little north of 37° N., navigable for rafts; the Great Zab, at 36° N., just below Nimrud, the ancient Calah; the Little Zab, about 35° 15' N.; the 'Adhem at 34° N.
South of Mosul, at which point navigation is blocked by two ancient dams, erected, apparently, to control the river for the Assyrian city of Calah, the ruins of which are called Nimrud by the natives after these dams, which they conceive to be the work of that mythical hero.
It remained the capital long after the Assyrians had become the dominant power in western Asia, but was finally supplanted by Calah (Nimrud), Nineveh (Nebi Yunus and Kuyunjik), and Dur-Sargina (Khorsabad), some 60 m.
At Nimrud (Calah) were also excavated, and hundreds of enamelled tiles were disinterred.
A crystal lens, turned on the lathe, was discovered by Layard at Nimrud along with glass vases bearing the name of Sargon; this will explain the excessive minuteness of some of the writing on the Assyrian tablets, and a lens may also have been used in the observation of the heavens.
This expedition was in fulfilment of a design which he had formed, when, during his former travels in the East, his curiosity had been greatly excited by the ruins of Nimrud on the Tigris, and by the great mound of Kuyunjik, near Mosul, already partly excavated by Botta.
Layard remained in the neighbourhood of Mosul, carrying on excavations at Kuyunjik and Nimrud, and investigating the condition of various tribes, until 1847; and, returning to England in 1848, published Nineveh and its Remains: with an Account of a Visit to the Chaldaean Christians of Kurdistan, and the Yezidis, or Devil-worshippers; and an Inquiry into the Manners and Arts of the Ancient Assyrians (2 vols.,1848-1849).
Modern Arabic tradition likewise ascribes the ruins, like those of Birs Nimrud, near Babylon, to Nimrod, because they are the most prominent ruins of that region.
The ruin mounds of Nimrud consist of an oblong enclosure, formed by the walls of the ancient city, of which fifty-eight towers have been traced on the N.
In Assyria the same digit appears as 0.730, particularly at Nimrud (25); and in Persia buildings show the 10-digit length of 7.34 (25).
Of Calah at Nimrud to the S.
(Nimrud-obelisk, line 15, monolith, line II) and Assur-bani-pal (Rassam cyl.
The plain extending from Urfa to a dozen miles below Harran has a rich red-brown humus derived from the Nimrud Dagh east of Edessa.
Such are Birejik, Jerablus, Tell Ahmar, IKa1 `at en-Najm, Balls, Karkisiya (Qargisiya, Circesium), on the Euphrates; Kuyunjik, Nimrud on the Tigris; Khorsabad on a small tributary; `Arban, Tell Khalaf, on the Khabur.
Birs or Birs-Nimrud), the Greek name of an ancient city about 15 m.