The true heart of Assyria was the country close along the Tigris, from lat. 35° to 36° 30’. Within these limits were the four great cities, marked by the mounds at Khorsabad, Mosul, Nimrud, and Kileh-Sherghat, besides a multitude of places of inferior consequence. It has been generally supposed that the left bank of the river was more properly Assyria than the right; and the idea is so far correct, as that the left bank was in truth of primary value and importance, whence it naturally happened that three out of the four capitals were built on that side of the stream. Still the very fact that one early capital was on the right bank is enough to show that both shores of the stream were alike occupied by the race from the first; and this conclusion is abundantly confirmed by other indications throughout the region. Assyrian ruins, the remains of considerable towns, strew the whole country between the Tigris and Khabour, both north and south of the Sin jar range. On the banks of the Lower Khabour are the remains of a royal palace, besides many other traces of the tract through which it runs having been permanently occupied by the Assyrian people. Mounds, probably Assyrian, are known to exist along the course of the Khabour’s great western affluent; and even near Seruj, in the country between Harlan and the Euphrates some evidence has been found not only of conquest but of occupation. Remains are perhaps more frequent on the opposite side of the Tigris; at any rate they are more striking and more important. Bavian, Khorsabad, Shereef-Khan, Neb-bi-Yunus, Koyunjik, and Nimrud, which have furnished by far the most valuable and interesting of the Assyrian monuments, all lie east of the Tigris; while on the west two places only have yielded relics worthy to be compared with these, Arban and Kileh-Sherghat.