So we have to cross an open uncultivated region for 40 miles or so from Baghnein to reach Derthel, on the Helmund. Again, "one crosses the Helmund at Derthel to reach Sarwan—a town situated about one day's journey off," on which depends a territory which produces everything in abundance. "Sarwan is bigger than Fars, and more rich in fruit and all sorts of productions. Grapes are transported to Bost (or Bist), a town two days distant passing by Firozand, which possesses a big market, and is on the traveller's right as he travels to Benjawai, which is vis-à-vis to Derthel." "Rudhan (?Rudbar) is a small town south of the Helmund."
The Helmund valley has been surveyed from Zamindawar to its final exit into the Seistan lagoons, and we know that at Girishk there is a very ancient ford, which now marks, and has always marked, the great highway from Kandahar to Herat. South of Girishk, at the junction of the Arghandab with the Helmund, we find extensive and ancient ruins at Kala Bist; and south of that again there are many ruins at intervals in the Helmund valley; but these latter are comparatively recent, dating from the time of the Kaiani Maliks of the eighteenth century.
Assuming that the Helmund fords have remained constant, and placing Derthel on one side of the river at Girishk and Benjawai on the other, we find on our modern maps that from the ford it is a possible day's journey to Kala Sarwan, higher up the Helmund, where "fruit and grapes are to be had in abundance," and from whence they might certainly have been sent to Bist, where grapes do not grow. Baghnein, separated from Derthel by a strip of nomad country, one day's journey wide, might thus be on either side the Helmund; but its contiguity to Ghur seems to favour a position to the west, rather than to the east, of the river, somewhere east of the plains of Bukwa about Washir.
Now it is certain that no Arab traveller, crossing the Helmund desert from the west by the direct route recently exploited in British Indian interests below Kala Bist and south of the river, could by any possibility have reached a grape-growing and highly-cultivated country in one day's journey. The inference, then, is tolerably clear. Arab traders and travellers never made use of this southern route. Nor should we ourselves make use of such a route as that via Nushki and the Koh-i-Malik Siah, were we not forced into it by Afghan policy. The natural high-road from the east of Persia and Herat to India is via the plains of Kandahar and the ford of Girishk, and the Arabs, with all Khorasan at their feet, were not likely to travel any other way.
Undoubtedly the system of approach to the Indus valley, open to Arab traffic from Syria and Bagdad, most generally used and most widely recognized was that through the Makran valleys to Karachi and Sind, whilst the inland route, via Persia and Seistan, made the well-known ford of the Helmund at Girishk, or the boat bridge at Kala Bist, its objective, and passed over the river to the plains about Kandahar. But it is a very remarkable, and possibly a significant, fact that the continuation of the route to Sind and the Indus valley from the plains about Kandahar is not mentioned by any Arab writer. Did the Arabs descend through any of the well-known passes of the frontier—the Mulla, Bolan, Saki-Sarwar, or Gomul—into the plains of India? Possibly they did so; but in that case it is difficult to account for so important a geographical feature as the frontier passes of Sind being ignored by the greatest geographer of his day.
Following Idrisi's description of the Helmund province we have a brief itinerary from the Helmund ford (Derthel or Benjawai) to Ghazni, said to be nine days' journey inland. None of the places mentioned are to be identified in modern maps except Cariat, which is more than probably Kariut, a rich and fertile district in the Arghandab valley in the direct line to Kalat-i-Ghilzai. This route passes well to the north-east of Kandahar, which was apparently of little account in Idrisi's days. Although there are extensive ruins at Kushk-i-Nakhud, indicated by a huge artificial mound half-way between Girishk and Kandahar, there is nothing in Idrisi's writings by which they can be identified.
Ghazni was then a large town "surrounded by mud walls and a ditch. There are many houses and permanent markets in Ghazni; much business is done there. It is one of the 'entrepots' of India. Kabul is nine days' journey from it." This is not much to say of the city which had been enriched by the spoils carried away from Muttra and Somnath, and by the treasures amassed during seventeen fierce raids of that Mahmud who, by repeated conquests, made all Northern and Western India contribute to his treasury.
Later, in 1332, the Arab traveller, Ibn Batuta, writes of Ghazni as a small town set in a waste of ruins—a description which fits it not inaptly at the present day; but in Idrisi's time, before the wars with Ghur led to its destruction, whilst still the wealth of a great part of India supported its magnificence, and whilst it was still the theme of glowing panegyric by contemporary historians, one would expect a rather more enthusiastic notice. But even Kabul (nine days' journey distant from Ghazni) is only recognized as "L'une des grandes villes de l'Inde, entourée de murs," with a "bonne citadelle et au dehors divers faubourgs."[5]
There is little to interest us, however, in tracing out the routes that linked up Ghazni and Kabul with the Helmund. They have been the same through all time, with just the difference of place-names. Towns and villages, caravanserais and posts, have come and gone, but that historic road has been marked out by Nature as one of the grandest high-roads in Asia, from the days of Alexander to those of Roberts. Two minars tapering to the sky on the plain before Ghazni are all that are left of its ancient glories, and one cannot but contrast the scattered debris of that once so famous city with the solid endurance of the far greater and older architectural efforts in Egypt and Assyria. Southern Afghanistan is indeed singularly poor and empty of historic monuments. Even now were Kabul, Kandahar, and Herat, its three great cities, to be flattened out by a widespread earthquake there would be little that was not of Buddhist origin left for the future archæologist to make a stir about.
Idrisi writes of the Kingdom of Ghur as apart from Herat, although a great part of the long Herat valley was certainly included. He calls it a country "mountainous and well inhabited, where one finds springs, rivers, and gardens—easy to defend and very fertile. There are many cultivated fields and flocks. The inhabitants speak a language which is not that of the people of Khorasan, and they are not Mohammedans." Who were they? The Khilkhis or Ghilzais we know at that time overspread the southern hills of Dawar; but who were the people speaking a strange language in the land of the Chahar Aimak where now dwell the Taimanis, unless they were the Taimanis themselves whose traditions date from the time of Moses?