The Gandarians held Kabul, and the mountain tract on both sides of the Kabul river as far as the upper course of the Indus, thus occupying the extreme north-eastern corner of the plateau, the region where its elevation is the greatest. Lofty mountain-ridges, ramifying in various directions but tending generally to run east and west, deep gorges, narrow and tremendous passes, like the Khyber, characterize this district. Its soil is generally rocky and barren; but many of the valleys are fertile, abounding with enchanting scenery and enjoying a delightful climate. More especially is this the case in the neighborhood of the city of Kabul, which is perhaps the Caspatyrus of Herodotus, where Darius built the fleet which descended the Indus. South of Aria and Gandaria, in the tract between the Great Desert and the Indus valley, the plateau was occupied by four nations--the Thamanseans, the Sarangians, the Sattagydians, and the Arachotians. The Thamanaean country appears to have been that which lies south and south-east of Aria (Herat), reaching from the Haroot-rud or river of Subzawar to the banks of the Helmend about Ghirisk. This is a varied region, consisting on the north and the north-east of several high mountain chains which ramify from a common centre, having between them large tracts of hills and downs, while towards the south and the south-west the country is comparatively low and flat, descending to the level of the desert about the thirty second parallel. Here the Thamanseans were adjoined upon by the Sarangians, who held the land about the lake in which the Helmend terminates--the Seistan of Modern Persia. Seistan is mainly desert. One third of the surface of the soil is composed of moving sands, and the other two thirds of a compact sand, mixed with a little clay, but very rich in vegetable matter. It is traversed by a number of streams, as the Haroot-rud, the river of Furrah, the river of Khash, the Helmend, and others, and is very productive along their banks, which are fertilized by annual inundations; but the country between the streams is for the most part an arid desert. The Sattagydians and Arachotians divided between them the remainder of Afghanistan, the former probably occupying south-eastern Kabul, from the Ghuzni river and its tributaries to the valley of the Indus, while the latter were located in the modern Candahar, upon the Urghand-ab and Turnuk rivers. The character of these tracts is similar to that of north-western Kabul, but somewhat less rugged and mountainous. Hills and downs alternate with rocky ranges and fairly fertile vales. There is a scantiness of water, but still a certain number of moderate-sized rivers, tolerably well supplied with affluents. The soil, however, is either rocky or sandy; and without a careful system of irrigation great portions of the country remain of necessity barren and unproductive.