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The variety and nature of morphological forms in the upland mass that forms Iran are closely determined by the prevailing climate. The massif of Iran rises generally within the Alpine orogenic zone of Eurasia. As regards geomorphology, the watersheds are significant first because of their course, and also because of the specific effects they produce within the general pattern of relief. The inner plateau of Iran may be regarded as divided hydrographically into two parts, by the southerly prolongation of the Caspian drainage system. Effects produced by shrinkage of the Caspian Sea itself are apparent as geomorphological features in the east, particularly in the Atrak valley. The rivers of the Zagros area that have the greatest elaboration of course and volume of water are located in the rainier north-west and west. The sump or kavīr structures are unique in that they possess no exact counterparts in any other region of the world.
Physically, Iran consists of a complex of mountain chains enclosing a series of interior basins that lie at altitudes of 1,000 to 4,000 feet above sea-level. In terms of physical geography, Iran comprises the western and larger portion of a more extensive mountain zone that extends from eastern Asia Minor and the Caucasus as far as the plains of the Punjab. There are four major divisions of the country: the Zagros system, including small outer plains (chiefly the Khūzistān region), which are part of the Mesopotamian and Persian Gulf lowlands; the Alburz and Tālish systems and associated Caspian plain; the eastern and south-eastern upland rim; and the interior central desert basins. Within this broad framework more local and subregional contrasts can be drawn. Whilst in a few instances precise demarcation between the major units is far from straightforward, for the most part the scheme allows easy breakdown into units of distinct geographical significance.
Any classification of the types of human settlement in Iran must be made on a scrupulously genetic basis; and care should be taken to distinguish among the various forms arising at different periods. Several types of rural habitats were prevalent in Iran including ancient village settlements, rural habitat in heavy rainfall-areas on Caspian Sea shores, and rural habitat in the open plains. The qal'eh village is the product of a pastoral civilization that was fraught with insecurity; it reflects the settled people's need to defend themselves, and their cattle, against the repeated incursions of the nomads. A map of the urban network as it is today shows the fundamentally asymmetrical disposition of the towns within Iran, and their relationship both with natural conditions and with the density of the rural population. Cities and towns are numerous in all those regions where rainfall is sufficient for agricultural purposes. They are located in the centre, the east, and the south-east of Iran.
About 129 species of mammals are found in Iran. Iranian fauna is classified as Palearctic species, Endemic species, Indian species, Africa species, and mixed species. Iranian mammals have responded in different ways to the physiological difficulties caused by a dry climate and variations in temperature. Insectivora have not acclimatized well; with the exception of hedgehogs, they are limited in number and variety. Of the domestic animals, Iranian saddle-horses are famous. There are numerous donkeys, and it is claimed that the special breed called "bandari" results from a cross with onagers. The cattle of the Caspian coast are of small stature; bulls (but not cows) have a hump like that of the zebu; Although, Iran is not threatened with the imminent extinction of all her larger fauna, certain species such as the Caspian tiger, are already in the course of disappearing.
Within the period of 1962-4, the Shāh government promulgated a series of decrees aimed at fundamental reform called as the "Six-point Reform". The most significant measures in this reform programme are those concerned with agriculture and the system of land holding. The Land Reform Law of 9 January 1962 contains a total of nine chapters dealing with a multitude of aspects of the reform, from transfer of ownership to the provision of agricultural services. The Law lays down that the maximum land area to be held in absolute ownership by one person is to be one village of six dang. The redistribution of land purchased under the regulations is also governed by the provisions of the law. The apparent success of the early implementation of the Reform Law gave rise to a more far-reaching plan for land reform embodied in the Additional Articles to the Land Reform Law which became generally known as Phase Two.
In Iran, particularly to the south of the Alburz mountains, water is indeed the most precious of commodities. This chapter examines in some detail conditions of water supply and irrigation in one small area of Iran: the rural zone surrounding Mashhad. Here, water is sourced from wells, and from qanāts, and direct from rivers and streams. The qanāt irrigation systems at Bīldār and Kāshif could be held to be generally characteristic of conditions elsewhere in the region, and probably for Iran as a whole. In an effort to minimize costs, the use of electrical power for irrigation pumps is becoming more widely used, since electricity can in certain localities prove cheaper than oil fuel. In the village of Murghānān, water for irrigation is brought direct from the Kāshaf Rūd which lies at a short distance to the south of the village.
In the religious history of Iran the Saljuq period is particularly interesting, for it is the period of the Isma'ills. This chapter devotes to the three main aspects of religious life in Iran during this period: the development of Sunnism, the ferment of Shi'I ideas, and Sufism. The importance of the Saljuq period in the religious history of Iran lies in its formative richness, expressed in various directions of thought: first, Ash'ari Sunnism reached its final systematisation in the great synthesis of Ghazali. Secondly, Sufism was first organized into great brotherhoods, and important schools were created. Thirdly, the philosophy of Suhravardi Maqtul opened up new paths to Iranian theosophical speculation. And fourthly, Shii ferment pullulated in Iran in the double aspect of Isma'Ilism, with its highly interesting esoteric theology, and Twelve Imamism, which, though now comparatively weak, created a wide network of propaganda centres, during the Saljuq period.
The period of Iranian history covered in this discussion began with the rise of the Turkish dynasties of the Ghaznavids and of the Great Saljuqs and ended with the small Iranian or Mongol dynasties which followed and contributed to the fall of the Il-khanid empire. In painting and the decorative arts, if we except the unique but comparatively short-lived art of objects on a broad social base which developed in the twelfth and thirteenth centuries, the principal novelty of the period consists in the first moments of the known history of Iranian painting. Mutatis mutandis and without in any way suggesting a relation of cause and effect between the two traditions, it may be suggested that Iranian painting of the fourteenth century stands toward later painting in the same relationship as Giotto and the Intenational Style stand to the Italian Quattrocentro.
This chapter discusses three periods in the socio-economic history of Iran during the Mongol dominion, ranging from the twenties of the thirteenth century to the eighties of the fourteenth century. In the Middle Ages invasions by conquering nomads of cultivated settled areas were normally devastative. The Saljuq conquest of Iran was accompanied by pillage and destruction. The destructive nature of the invasion of Khurāsān by the Oghuz of Balkh in the fifties of the twelfth century is notorious. The Mongol conquest took an equally heavy toll in Tabaristān (Māzandarān). The reforms of Ghazan and the temporary transfer of a leading political role in the State from the nomad Mongol-Turkish aristocracy to the Iranian civil bureaucracy made some economic improvement possible, especially in agriculture. The Mongol conquest had a great and in general evil influence on the economic development of Iran; it had much less influence on the social structure of the country.
In this brief examination of the internal structure of the Saljuq Empire the author has attempted to show that nothing, religious or temporal, lay outside the care and concern of the sultan. Ghazali's new definition of the relationship between the sultanate and the caliphate was an attempt to authorize the sultan's government. The Saljuqs, who had started out as the leaders of a tribal migration, were gradually transformed, partly under the influence of Ghazali and Nizam al-Mulk, into the rulers of a centralized state. The main features of the new organization of state-notably the structure of the divan, the iqtac system, and the close connexion between the assessment of taxes and the levy of troops-are also to be found in the Safavid and Qajar periods. Through the officials of the divan, the muqta's and provincial governors, the officials of the religious institution, and local officials, the sultan came into contact with all aspects of the life of his people.
The Mongol invasion of Persia, which began in 1220, together with the subsequent fall of the Baghdad caliphate and the killing of the last ‘Abbāsid caliph, al-Musta‘sim billāh, brought the entire Muslim world and especially Persia face to face with unexpected and formidable problems. The Mongol invasion, then, strengthened the non-Muslim communities in Persia. At the time of the Mongol invasion two tariqas had a predominant influence in Iran: the Kubrāviyya in the East and the Suhravardiyya in the West. In the history of religion in Iran, the Mongol period is important for a number of reasons. First, it saw a strengthening of Shī‘sm as a consequence of the fall of the ‘Abbāsid caliphate, and this was accompanied by a proportionate mitigation of the Shī‘ī-Sunnī dispute, the appearance within Shī‘sm of trends towards Shī‘sm, and a leaning towards a certain tashayyu' hasan ("moderate" Shī‘sm) in Sunni circles. And finally, Shī‘sm made particularly noteworthy progress, especially in its doctrinal tendencies.
Throughout the Middle Ages a succession of Muslim scholars worked along two lines, one of which led them to generalize the concept of a number. The second can be thought of as an examination of the nature of euclidean geometry which, in modern times, culminated in the appearance of the various non-euclidean geometries. Of the latter, only the first faint foreshadowing occurred in Saljuq and Mongol Iran. Saljuq and Mongol times are to be regarded as a period of consolidation in trigonometry rather than one of innovation. In antiquity a few individuals, notably Aristotle and Seneca, had attempted explanations of rainbow formation, but with little success. That these achievements were of a lesser order than those of Archimedes, and that their consequences were incomparably less significant than the scientific breakthrough which followed the work of Newton and Leibniz is perhaps irrelevant. The scientists of Saljuq and Mongol Iran were the best of their age.
The chronology of Sultan Muhammad's first contacts with the Mongols is extremely confusing, and it is difficult and sometimes impossible to reconcile the accounts of the various authorities. Sultan Jalal al-Dln remained in India for nearly three years. He was joined, on the very banks of the Indus, by a number of stragglers from his defeated army and after several successful encounters with bodies of Indian troops in the Salt Range found himself at the head of some three to four thousand men. By the virtual extinction of the Isma'ili sect, Hülegü had rendered a great, if unintentional, service to orthodox Islam. The armies passed through the mountain pastures of Ala-Tagh to the east of Lake Van: Hülegü was pleased with this region, afterwards a favourite summer resort of the IL-Khans, and gave it a Mongol name. The terms which Abaqa's emissary transmitted to Baraq were generous enough.
This chapter touches on the era of the "Great Saljuqs" only in its last phase, that is, towards the end of the reign of Sultan Sanjar, a monarch who was then decadent though he was later idealized. The Saljuqs are a remarkable phenomenon, and we should therefore cast at least a cursory glance back to the period of their real greatness; for this wholly Turkish dynasty, holding sway over an immense area, played a very considerable part in the expansion of the Persian literary language and of Persian culture in general. The official language was Persian, and in it was conducted the official correspondence of the court, in contrast to the practice under Mahmud. Poetry also flourished during the period of the decline and fall of Saljuq rule, but the forms perfected by the old masters were already dying out and poetry was developing in an entirely new direction. Sa'di's principal didactic works are the Bustdn and the Gulistdn.