From Balkh, or Mazar-i-Sharif, or from Deh Dadi (the new fortified position near Mazar) the most direct routes southward either follow the Balkh Ab valley to Kupruk and the Zari affluent, and then crossing the Alakah ridge pass into the river valley again, and so reach the Band-i-Amir and the head of the river at Yakulang; or passing by the Darra Yusuf (a most important affluent of the Balkh River) attain more directly to Bamian. Balkh and Mazar lie close together on the open plain, and about 10 miles to the south of them rises the northern wall of the plateau called Elburz, through which the Balkh River, and other drainage of the plateau, forces its passage. Thus the whole course of the Balkh River, from its head to within a mile or two of Balkh, lies within a deep and narrow ditch cut out from the plateau which fills up the space from the Elburz to the great divide of Central Afghanistan. East and west of the Balkh River the plateau increases in elevation as it reaches southward, culminating in knolls or peaks 12,000 and 13,000 feet high about the latitude 35° 30', and falling gently where it encloses the actual sources of the river. It is this plateau, or uplift, which forms the dominant topographical feature of Northern Afghanistan. West of the Balkh Ab it is represented by the Firozkohi uplands, which contain the head valleys of the Murghab, bordered on the north by the Tirband-i-Turkistan from the foot of which stretch away towards the Oxus the endless sand-waves of the Chol, and by the highlands of Maimana and Sangcharak, and which trend northward to within a few miles of Balkh. At Balkh its northern edge is well defined by the Elburz, but between Balkh and Maimana it is more or less merged into the great loess sand sea, and its limitations become indefinite. East of the longitude of Balkh it is lost in a distance whither our surveyors have not traced its outlines, but where without doubt it fills a wide area north of the Hindu Kush, determining the nature of the Badakshan River sources and shaping itself into a vast upland region of mountain and deep sunk gully, and generally preserving the same characteristics throughout, till it overlooks the valley of the Oxus. That part of it which embraces the affluents of the Balkh Ab and the Kunduz is described as intensely wild and dreary, traversed by irregular folds and ridges which rise in more or less rounded slopes to great altitudes, hiding amongst them deep-seated valleys and gulches, wherein is to be found all that there is of cultivation and beauty. From above it presents the aspect of a huge drab-coloured, hill-encumbered desert where man's habitation is not, and Nature has sunk her brightest efforts out of sight. These efforts are to be found in the valleys, which are excavated by ages of erosion, steep sided, with precipitous cliffs overhanging, and a narrow green ribbon of fertility winding through the flat floor of them.