Abstract
The Zab River basin contains the cities of Piranshahr and Sardasht in West Azerbaijan and parts of the city of Baneh in Kurdistan. The Zab River rises from the Northwest highlands of Piranshahr and after joining many branches passes through the highlands of Alan in Iran and enters Iraq. The extension of this basin is a relatively vertical strip along the Iran-Iraq border and the Little Zab River. Its orientation is Northwest to southeast and from west to east. The Zab Basin is located in an area with a cold and temperate mountainous climate, a Mediterranean rainfall regime, with average annual temperatures between 11.7°C and 13. 3°C and, 700 ml annual rainfall (Hojabri et al 95). This article tries to answer the question of how the cultural relations between this point and other areas of the presence of the late bronze culture have been established by studying the cultural materials belonging to the late bronze cultural tradition in Akhoran tepe. Also, what was the chronology of the stables? The results of archaeological excavations led to the identification of a late Bronze Age camp. The study of Akhoran cultural materials also indicates the presence of a late bronze pottery tradition. Studies and relative chronology of pottery showed that most of the cultural interactions and influences were with Hasanlu regions and outside the borders of Iran with Anatolia and Iraqi Kurdistan. The present study is based on archaeological excavations and then library studies and with a descriptive-analytical approach tries to introduce new pottery of the late Bronze Age.
Keywords: Northwest of Iran, Late Bronze Age, Zab Basin, Akhoran Tepe, Archaeological Excavation, East of Anatoli.

Introduction
The Bronze Age is considered to be the beginning of major social changes in the early third millennium BC. The Hasanlu VI period or the Middle Bronze Age covers from 2100 to 1700 BC (Danti 2013:332 .Table 17.1). During this period, multi-colored and painted wares were commonly used in large parts of Azerbaijan (Dyson 1969). Hasanlu VI ceramic designs were in crossed, checkered, and triangle forms (Dyson 1965). The simple painted pottery, which is the characteristic of the Middle of the 2nd millennium BC, is the same as synchronously identified dishes of Khabur from Northern Mesopotamia and South West Turkey (Dyson 1969: 43-44). Our information on late bronze age in northwest Iran is quite limited. Hasanlu V, is of great importance in this region, but the period has been given relatively little attention. We therefore selected Akhoran Tepe for excavation with the goal of closing this chronological gap in our understanding of Iranian prehistory.
As a local center, the Zab basin generally witnessed the alternation of contacts and conflicts, as is evidenced by the varying patterns in the distribution of recorded sites. Unlike what is characteristic of Mesopotamia and southern Iran in the fourth millennium BC, it has not yet produced any traces of extended settlements and social complexities. 
Previous studies have illustrated that northwest Iran maintained contacts with regions south of Caucasia and the valleys hemmed in by the Aras and Kura rivers to the north, the Central Zagros to the south, and eastern Anatolia and north Mesopotamia to the west via mountain passes. 
Recent archaeological data from the adjacent neighboring regions has corroborated this observation. Therefore, serious investigation in the region has the potential to shed light on broad cultural interactions and evolutions in the middle and northern Middle East. 
The data from Akhoran is thus of considerable importance in this respect, and can improve our understanding of regional and inter-regional interactions. A foremost purpose of this paper is to look into the ties and connections between Akhoran and northwest Iran as a whole, and to explore intra- and inter-regional interactions.
One of our fundamental problems in North West Iran was the lack of excavations, with little information about the Archaeology of the region. The current paper focuses on Akhoran Tepe since we have had a little knowledge about the late Bronze Age in the Little Zab River. 

Archaeological Background
North West Iran has a particular Archeological importance since it accumulates different prehistoric periods. The area is also important from the point of view of Archeological literature since it is at a crossroad facilitating the passing of nations and trading. With regard to the history, the basin is among those that attracted the attention of domestic and foreign scholars at the dawn of professional Archaeology in Iran (Motarjem Sharifi 2014: 50).
A long-lasting Hasanlu Project started by the Museum of the University of Pennsylvania in 1956 under the guidance of Robert H. Dyson, is the most significant work carried out in this basin (Dyson, 1968; 1969). On the other hand, the work at Yanik Tepe, the Northeastern basin of the lake began in 1960 by Charles Burney that furnished important details, among them the identification of the Trans-Caucasian culture’s infiltration into Northwestern Iran (Burney 1961; 1962; 1964). Indeed, earlier excavations conducted by Burton-Brown at Geoy Tepe, in the same basin, had uncovered evidence of the Trans-Caucasian culture at Level K (Burton Brown 1951). Later excavations by Burney at Haftvan Tepe brought to light further aspects of the Bronze and Iron Age cultures.
This region experienced the Middle Bronze culture known as Urmia ware with monochrome and polychrome pottery. Danti divides the Middle Bronze Age into three periods (Danti 2013: 332).
We also know about the Urmia ware in Haftavan VIB. Investigation and recognition of the Urmia ware was carried out by Edwards (Edwards 1983).

Conclusion
Akhoran can well supplement the limited dataset at hand for Hasanlu V. An important point about this site is the absence of the middle bronze material culture. Tepe Akhoran is one of the sites with deposits of the Late bronze age within the prospective reservoir of the kani sib  Dam. The main objective of this excavations is to establish the cultural sequence of the site. Other aims include dating the most important settlement attested at the site, and pinpointing the subsistence system of the late bronze age community that occupied it. The nature of the settlement and material culture of the Hasanlu VI period in Dinkhah Tepe and the limitation of the Khabur pottery to the southern areas of Lake Urmia strongly suggest that during this period, people from Mesopotamia migrated to the Ušnu- Solduz valley (Danti et al 2004.584).  In the Piranshahr area, excavations at Akhoran Hill provided evidence of a new bronze tradition in the Zab Basin.
The most important cultural material of the Akhorn  in  late  bronze age is  potteries, which is produced in a simple and painted sherds. The pottery from Tepe Akhoran is comparable to the material coming from the, Azerbaijan and the Anatoly. 
The pottery is decorated with geometric patterns. The shape of the dishes is more inclined to closed-mouth dishes. Also, what the data of Akhoran excavations show indicates the cultural relations of this region with other parts of the Urmia Lake basin, including Hasanlu, and outside the borders of Iran, the areas of Anatolia and Iraqi Kurdistan. This area may be geographically more inclined to Anatolia. 

Tappeh Bazgir is one of the most important archaeological sites of the Late Bronze Age in northeastern Iran. At this site, a hoard of 759 Bronze Age copper-alloy objects with an approximate weight of more than two tons was excavated. This find is unique in terms of volume and the extraordinary finds it contained. This archaeological hoard was discovered by chance in 2001, and in 2010 a rescue excavation was carried out at the findspot. This hoard had been buried in the virgin soil and deliberately concealed under a residential floor in the Late Bronze Age. The objects recovered served different purposes; they include agricultural and household implements, tools, ceremonial objects and a variety of weapons. The artifacts were all located next to each other in a pit and had been arranged in a regular manner. There were also three shields among these objects. They had been placed next to each other under basins with gutter-shaped pipes and on top of daggers, hatchets, axes, two-pronged forks, and stone rods. These weapons had evidently been positioned at close to the domestic objects. The shields are of strikingly similar shapes, but they differ slightly in the number of openings and bars. Up to now, no similar shields have been found at any other archaeological site. These shields seem to be the oldest shields excavated in Iran. XRD and XRF analyses revealed that one of the shields and other objects of the hoard were made of cast copper-alloy, and they were subjected to cold forging/hammering later.

Abstract
One of the facts that can be seen in the archaeological contexts of the late Bronze Age in the abandonment or excessive reduction of the enclosures. At the end of the Bronze Age, many sites and settlements in the Iranian Plateau and outside the Iranian Plateau collapsed suddenly and unexpectedly, or the growing process of these societies has stopped. Researchers have considered several factor such as floods, earthquakes, immigration of newly arrived ethnic groups, etc. for this event, to these factors we can also add the effect of factors such as over urbanization, which has not been addressed much. As a result of over urbanization, challenges such as; Regional thermal changes, destruction of habitat and biodiversity and ecosystem as accelerating factors in the crises of this period could further worsen the situation. The result of this research show that after the increase in population in urban centers due to the lack of administrative planning to control the conditions caused by dense urbanization and as a result the disruption on environmental order and natural balance, the society has tried to restore the natural conditions as a stable system this attempt to return to the balance has been manifested in various ways, such as the decision to leave large settlements and move to peripheral and peripheral areas with sufficient food and water resources. The evidence of this event can be seen in areas such as Merv, Northern and Southern Balkh, and Doab areas in eastern Sind; in some cases, the crisis in the societies has increased and it has appeared in the form of newer problems such as famine and epidemics, inter regional conflicts and such things, which have led to the collapse of societies.
Keywords: Bronze Age crisis, Late Bronze, Over Urbanization, Eastern Iran, The Decline of Settlements and Civilization. 

Introduction
Over urbanization or excessive urbanization is generally used in cases where the urban population has grown unplanned and beyond the capacity of the environment and city administration, which causes the transformation and sometimes degeneration of urban communities (see Sovani, 1964). Therefore, the increase in the number of the population and the lack of environmental resources in the administration and organization of the urban population could act as a factor to disrupt the path of the Bronze Age societies. The decline of settlements and civilizations at the end of the Bronze Age is very important, and the first major collapses of the prehistoric era took place at this time, which occurred widely and in large areas of the old land. The Bronze Age in the archaeological literature refers to a period when societies gradually more from rural to more complex or urban and create trans-regional connections. Obviously, what is expected is the continuation of the development and progress of societies towards the emergence of larger and more complex civilization and states, which reached their peak of prosperity during the middle Bronze Age (see Tosi, 1976: 168). But what happened in the late Bronze Age is the abandonment of sites and depopulation of a large number of them, which can be seen as a chronological break in many Ancient sites? The evidence indicates an event during which large settlements such as Shahr-I Sokhta (Tosi, 1968). Mohenjodaro (Wheeler, 1968), Harappa (Wheeler, 1968), Altin Tepe (Masson, 1981), collapsed, although some small settlements such as Tekem Tepe (Kohl, 1984) continued to exist without any interruption. The concentration of population in urban areas and the impossibility of providing in frastructure needs in urban life due to the occurrence of over urbanization had led to disorder in social structures and population decline in Mohenjodaro and Harappa settlements. If the elites of the society do not manage or solve the problems caused by excessive urbanization, difficult conditions will arise and the society will probably solve the problem or become a problem in the form of a self-organizing system. The evidence shows that in some settlements such as Mohenjodaro, Harappa and Altin Tepe, people decided to leave the large settlements and settled in peripheral areas, and this caused the settlements to become uninhabited in the late Bronze Age. 

Identified Traces
Urbanization, which was actually a cultural and social revolution, appeared sometime between the end of the fourth millennium and the beginning of the third millennium bc in western Asia, Egypt and Mesopotamia (Childe, 2019:1). But at the end of the Bronze Age in a wide area of the east, especially the southeast region of Iran and even beyond the current borders of Iran, such as; Central Asia and the Indus valley, many large settlements such as Shahr-I Sokhta (Tosi, 1968), Tepe Hesar (Schmidt, 1937; Dyson, 1989), Namazga (Kohl, 1981) area have declined and shrunk excessively. There are several theories about the crisis of the late Bronze Age, such as the invasion of the Aryan tribes (Girshman, 1954), disease (Robbins Schug et al., 2013), famine and earthquakes (Nur, 2009), etc., but since this discussion is about societies with an advanced level of technology and in constant relations with are their peripheral areas. The factor of excessive urbanization can be added to the above. Rapid urban growth will have consequences for the urban society. Such as the lack and absence of drinking water, urban heat island effects, unpredictable rainfalls, and increasing demand due to population growth cause environ mental destruction and air pollution. For example, in the Indus valley in period IIIC, due to extra-regional trade and large inward migrations, the previous organized settlement pattern was disrupted. The houses in the main areas of the city were thrown into the streets and then at the end of the Harappan phase, the population density decreased and some of them were concentrated in the main areas of the city and the other part moved to the east. In Turkmenistan, even though the archaeological data indicates a decrease in the Kopedagh area, no settlements are abandoned in Atak and other areas, especially Merv and Balkh.

Conclusion
In general, based on archaeological findings, the cities were formed from the old Bronze Age and reached their peak of prosperity during the middle Bronze Age. But at the end of the third millennium and the beginning of the second millennium B.C. the evidence indicates that the sites were excessively shrunk and empty of inhabitants, or the collapse of large settlements. This could have been caused by over urbanization on the basis that whenever the society’s population grows beyond the environmental resources and facilities necessary to organize people, it can create crises for urban societies. Crises such as; the increase in urban rainfall and temperature, the increase in urban waste, the lack of drinking water sources and the destruction of the environment for human well-being in large societies with high population. With the increase of urban population and the lack of resources to organize people it leads to an increase in crime, marginalization and disorder in urban organization, and when the political rulers cannot solve or manage the created problems, the people of the society left the cities and went to the marginal and peripheral areas with stable food and water resources, such as Merv, Northern and Southern Balkh, to continue their lives.