Abstract
Aleshtar plain is central part of Selseleh county and located in North Loristan province. This plain is region lush and with pleasant weather and rich soil. This area has been from prehistoric period so far always settlements folks and different groups human. Location of Aleshtar plain and proximity with Northern areas Zagros, Central Plateau, Southwest Iran, and Mesopotamia, for a long time to this area has particular importance of communication. Authors, after explaining the climate and ancient roads Aleshtar, have analyzed dispersion form of ancient and historical settlements this area. In this regard, using with ArcGIS software (version 10.3) location of each site is specified in Aleshtar. Output of ArcGIS software, is four maps in Chalcolithic, Bronze and Iron, Historic, and Islamic periods. After studies is specified approximate route of ancient road in Aleshtar plain (north-south road in central Zagros). Therefore, combining the two points, included, ancient road north-south and also distribution of ancient and historic sites in Aleshtar plain, in before and after Islamic periods, this question was raised: what role has this ancient road in Aleshtar plain in the formation ancient settlements? For this question, authors with preliminary survey in Aleshtar plain they had this hypothesis: basically, this ancient road from Islamic periods has played a pivotal role in the formation of sites. Analysis distance of each site from this ancient road has showed, most archaeological sites has been formation in Aleshtar plain from the Islamic period along this route; In the Pre-Islamic periods, hasn’t been focus center of settlements around this ancient road with distance of about two kilometers. Data of this study is based on archaeological research Ali Sajjadi in 1998 and Davood Davoodi in 2006 and 2007. Also, authors have done again surveyes in this area.
Keywords: Aleshtar plain, Settlement, Ancient roads, and GIS Analysis.

Introduction
Selseleh County is located in north of Lorestan and in South of Hamedan Province. From Aleshtar city is mentioned in various sources. This point has been indicative importance this region in Pre-Islamic and Islamic periods. Archaeological survey that so far has been done in Aleshtar plain, confirms importance of this area. In Aleshtar before all, by Oral Stin has been done archaeological survey (Stin, 1940). Colar Goff in during archaeological surveys in North Lorestan; She has also surveyed Aleshtar (Goff, 1968). In 1998, Ali Sajjadi was surveyed Aleshtar from administration of Cultural Heritage of Lorestan province. Now, report her work is in archives administration of Cultural Heritage of Lorestan province (Sajjadi, 1998). Furthermore, in 2006 and 2007, Davood Davoodi was surveyed historic and ancient monuments Aleshtar in during two seasons (Davoodi, 2006 and 2007). Authors, in order to explain process settlement in Aleshtar plain, and measurement influence of climatic conditions area, and importance of ancient and historical roads of this region, have done draw a map ancient settlements of Aleshtar plane in Chalcolithic, Bronze and Iron, Historic, and Islamic periods. For this purpose, has been used from report of survey Ali Sajjadi (Sajjadi, 1998), and reports of surveys Davood Davoodi (Davoodi, 2006 and 2007), and also, again surveyes authors in this area. In this research, has been used for register ancient sites on the map from ArcGIS software (version 10.3). So, authors in this research try to analyze the following issues:
What role has this ancient road in Aleshtar plain in the formation ancient settlements? And essentially, role of road north-south in Aleshtar plain at what period is seen? The main hypothesis of this research, it is: Around of ancient road in Aleshtar plain in Islamic period has been settlement. In the Pre-Islamic period, hasn’t been focus center of settlements around this ancient road with distance of about two kilometers.

Settlements of Aleshtar plain from prehistoric to Islamic periods
The Communication route that has been connected West to Southwest of Iran (Hamedan and Kermanshah to Khozestan plain), one of the most important route of communication in Pre-Islamic periods, and this road has been connected West and Northwest to regions of Southwest Iran. Continue this road has been crossed from Aleshtar plain. Study location of sites from prehistory to Islamic periods has points, has been effective in description of problem, settlement patterns and also role of ancient roads in this area in formation of settlement patterns. In study area, were identified in total 96 settlements sites. The sites were divided into four groups, that including Chalcolithic, Bronze and Iron, Historic, and Islamic periods. According to, in Aleshtar plain were identified 27 sites related to Chalcolithic period. It seems, in this period entire Aleshtar plain has been inhabited. Most of settlements are seen in around rivers of Kahman and Zaz. However, in the eastern part of Aleshtar, is seen number large sites settlements related whit this period. Also, in this area were identified 28 sites related to Bronze and Iron periods. Checking the distribution map of sites in these periods, interpretations related whit Chalcolithic period is show. In this period entire Aleshtar plain has been inhabited. In Historic periods (especially Parthian period), we see increasing number of sites in Aleshtar. In this area were identified 82 sites related to Historic periods. Furthermore, in Aleshtar were identified 52 sites related to Islamic period. In this period number of sites has dropped relative to previous period. In this period, aggregation of sites is in central area of Aleshtar.

Conclusion
Climatic and environmental conditions also ancient roads, is two major factors in relation to settlement patterns in Aleshtar plain from prehistoric to Islamic periods. In Chalcolithic, Bronze and Iron, and Historic periods is settlement of pattern absolutely scattered and dependent on water resources and land. In these periods aren’t interpretable of focus in sites Aleshtar. In Islamic period, aggregation of sites is in central area of Aleshtar. Two to three kilometers in North and West in Modern city of Aleshtar has largest number of sites from Islamic period. In Islamic period settlement of pattern is around ancient road (north-south) in Aleshtar plain.

Abstract
Tepe Betaki is one of the most known ancient area in Aleshtar and for the reason there were some studies about it from so yours ago. The primitive studies shows that there is cultural periods from prehistory periods to Islamic periods. In this connection to maintain of Tepe Betaki, the writer had mission to study to determine the limits of it. The surface analyzing was continued in this mound from 29 July to 11 August 2018. In the time, it was studied carefully and 17 trench 1/5×1/5 m were made in different directions during the surface analyzing. The purpose was to record the ancient cultural findings in different areas. For this purpose, the mound was divided to 5 zones North, West, South, east and central and each was studied carefully. The purpose was to separate different zones to record cultural findings and to recognize the different cultural material of the mound. Therefore, the analyzing of bronze era existence in Tepe Betaki and the mound studying to show the spreading cultural material of different zones are the samples of Bronze era were collected and studies typologically. These samples were selected from 330 samples. It means that only 22 tile samples were about Bronze era. Therefore, in spite of wide extent of Tape Betaki and enrichment of culture in the next period the Bronze era is not considerable. 
Keywords: Aleshtar, Tepe Betaki, Bronze Era, Ceramic, Typology.

Introdution
One of the main challenges of archaeology researchers always was to description of chronology study is chronology that exist during working in decades. Therefore, in fact the study which was done in this area was a part of a great archaeological project including trench in order to determine of limits. During the actions trench of the mound limitation 17 trench 1/5×1/5 m around the mound was performed. After studies and excavations, 330 tile samples were obtained which only 22 samples were about Bronze era. The collected tiles were categorized typologically. Therefore, the studying of Tepe Betaki in Bronze era in different phases of Godin III and spreading of Bronze era cultural material in different parts of the mound are the 3 km distance between Tepe Betaki and Tepe Gariran (the biggest mound in Aleshtar plain). The central position and surrounding theory is also studies.
In these areas, the archeological studies have been done in past decades. There were less archeological studies in Aleshtar in proportion to Nahavand and Kangavar. Orel Stine studies areas the first archaeological studies in this area (Stine, 1940). Davoud Davoudi had done survey and documentary is Aleshtar archaeological site in two periods in 2006 and 2007 (Davoudi, 2006, 2007). Clare Gaff archaeological excavations in Babajan Tepe are as the first in Norabad (Goff, 1969). He did some wide surveys in Lorestan in addition excavation in Babajan Tepe (Goff, 1971). Abbass Motarjem was excavation in autumn 2017 in Tepe Gariran. 

Geography and Topography of Tepe Betaki
Aleshtar is one of the 11 cities in Lorestan province which is located in North of Lorestan province. The central part includes wide plain called Aleshtar plain. Tepe Betaki is located in North – West of the plain and near a village by point is highest 1603 meter above sea level. The topography of the mound related to the mound high and around lands in North has more gradient and less in other sides. Tepe Betaki was recorded as national monument of Iran in 2 October 2011 (2011/10/2). 

Surface Studies Finding
Before, trenching group did a survey analyzing. It is important in some aspects:
- The study of cultural material dense in different parts of the mound.
- The study of cultural material in Tepe Betaki.
For this purpose, trenching group was divided into 5 groups. They began to study in 5 parts. The 5 parts were: South, East, North, West and center of this mound.

Bronze Era File Findings of Tepe Betaki
As said, 17 trench were done to determine the Tepe Betaki. From these trenches 16 trenches were about bronze era. The findings were obtained respectively one sample of T.T.A trench, one sample of T.T.D trench, two samples of T.T.F trench, five samples of T.T.G trench, five samples of T.T.G1, one sample of T.T.G2 and one sample of T.T.H. Besides tile findings of trench, six samples also were obtained in surface studying. Therefore, from excavated 17 trench and analyzing of 22 samples from survey were about Bronze era.

Conclusion
All the ceramic findings of surface analyzing and excavations were 330 samples which only 22 samples related to Bronze era. Bronze era ceramics of Tepe Betaki show that phases III:4 and III:2 are available. Meanwhile these two phases tiles are a few. In the period in Aleshtar plain, Tepe Gariran with 3 km distance from Tepe Betaki has 13 hectares and all kinds of Bronze era ceramics. Therefore, it seems that Tepe Betaki in Bronze era was surrounding settlement rather than Tepe Gariran. The surface monuments show cultural periods pre-history, history and Islamic periods. 41 samples of typology materials in surface analyzing in Tepe Betaki, 18 samples were related to pre-history period, 11 samples to Islamic and 6 samples to Bronze and 5 samples to Chalcolithic periods. Therefore, most of typology materials were related to history period and mostly Parthian period.