Great Khorasan, Objective Reality or an Abstract Concept

In the past centuries, Great Khorasan always involve a wide scope of Iranian territory was considered ground. This region in different periods, have been a special historical and political circumstances, and so the imaginary world of scientific documents has spread, in past centuries since the ancient Iranian tribes of Iran and is attributed, and also,historically the focus of the initial state has been considered ancient. Khorasan from the side, who have read this name in ancient Persian means the land east of there where the sun rises, is used. Actual geographical extent of Khorasan has long ago been fixed boundaries and affect change and transformation has been routinely However, the region than Iran, part of the modern soil of Afghanistan, Tajikistan, Uzbekistan and Turkmenistan in has taken over. Considering the importance and situation that determines the territory of Iran and the developments in the region, always on the appellation, the area of geography and history in scientific circles, criticism and analysis has been done several. Therefore, this study also based its focus to these three components built with the look and analytical - descriptive issue focuses on the analysis.