The Yazoo Valley is a district of oval form, two hundred miles long by sixty wide, extending from a short distance below Memphis to Vicksburg, where the hills which form its eastern boundary again reach the Mississippi. The land is alluvial and, when not protected by levees, subject to overflow in ordinary rises of the river, with the exception of a long narrow strip fifteen miles from and parallel to the eastern border. It is intersected by numerous bayous and receives many streams from the hills, all of which, from the conformation of the ground, find their way first to the Yazoo River, and by it to the Mississippi. The Yazoo is first called, in the northern portion of the basin, the Cold Water, then the Tallahatchie, and, after receiving the Yallabusha from the east, the Yazoo. In the latter part of its course it is a large stream with an average width of three hundred yards, and navigable always, for vessels drawing three feet of water, as far as Greenwood, a distance of two hundred and forty miles. It flows in a southerly direction along the eastern side of the basin, between the hills and the narrow strip of dry land before mentioned, receiving the streams from the former, which it does not touch except at Yazoo City, eighty miles from its mouth. After passing Yazoo City the river makes several successive bends to the west, and then begins to receive the various bayous which have been pursuing their own southerly course on the other side of the strip of dry land, the principal one of which is the Big Sunflower. At the present day the Yazoo enters the Mississippi eight miles above Vicksburg, but formerly did so by another bed, now a blind lead known as the Old River, which diverges from the existing channel about six miles above its mouth. Neither rivers nor bayous are the simple streams thus described. Separating at times into two or more branches which meet again lower down, having perhaps undergone further subdivisions in the meanwhile, connected one with the other by lateral bayous, they form a system of watercourses, acquaintance with which confers the same advantage as local knowledge of a wild and desolate country. Opposite Helena, in the natural state of the ground is a large bayou called Yazoo Pass, leading from the Mississippi to the Cold Water, by which access was formerly had to Yazoo City; but before the war it had been closed by the continuation of the levees across its mouth. When not under cultivation, the land and the banks of the streams are covered with a thick growth of timber. Where the troops or gunboats penetrated, it was found that there was abundance of live stock, stores of cotton, and rich harvests of grain. The streams carried on their waters many steamers, the number of which had been increased by those that fled from New Orleans when the city fell; and at Yazoo City the Confederates had established a navy yard, where at least three powerful war vessels were being built for the river service.