1.1 GEOGRAPHICAL LOCATION AND BOUNDARIES OF THE AREA
This report covers an area of about 8 000 sq. km in the Gazik district (figure 1).
The study zone corresponds to the Gazik map at 1:250 000, which itself includes the areas covered by sheets 8054, 8154, 8055 and 8155 at 1:100 000. The boundaries of the zone are as follows :
to the north : latitude 33° N
to the east : the frontier with Afghanestan
to the south : latitude 32° N
to the west : longitude 60° E.
The highest point in this area (elevation 2 518 m) is situated in the south-western chain of Kuh-e Baran ; the lowest points, around 600 m elevation, are represented near the border with Afghanestan, to the east of the Eastern Ranges. These Eastern Ranges, trending N 160° E, cross the zone from south to north with heights ranging from 1 300 to 2 100 m.
Topographically, the zone may be divided into four units : two mountain ranges and two depressions. From west to east these are :
- the Kuh-e Barran Ranges in the SW sector, taking up most of the surface of sheets 8054 III and IV,
- the Doreh and Tabas depression,
- the Kuh-e Namdan and Kuh-e Showku Ranges (Eastern Ranaes)
major reliefs made up of two or three ridges trending N 160° E, related to the first range by a series of low hills (Kuh-e Zanzal) crossed by the Doreh Birjand track,
- the eastern depression, covering most of the area close to
the border with Afghanestan, with Mesozoic limestone reliefs in the north, cut up and weathered by the prevailing east winds.