Spatial Distribution (Separation and Texture of Capital Cities in Great Khorasan) from tical Geography Viewpoint

The category of capital or political centralization in great khorasan have possess ups and downs in the all of history and in the following of government change the capital expect in the limited cases has been moved from city to city.At a glance to historical past related to this changes and developments showed that different motivations has been caused the movement of political center due to place, period and social government structure and with considering the political strategy and geopolitics issues period this motivation in the first instance has been influenced political, military. Security and ecological geography and in second in stance resulting from economical and social geography in the different go vernment. In this regard, in this research after examination of generalities of great khorasan geography and also different specialties of its geography with emphasis on its border and capitals the historical geography study of great khorasan and its political, economical and social geography to take into consideration in the pre-post Islam period.