Sogdian City-Oasis

In the civilization region of Iran, Sogd (Sogdiana) land is the earliest in building, growth and development of the city. The etymology of Sogd shows that its meaning is "town and residence". The residents of Sogd were the first urbanized people and the sides of Sogd (Zarafshan / Zeravshan) river are reckoned as the best place in nature and climate for the growth of the city. Although there were repeated attacks of eastern desert invaders (nomadic); being in the side of water, having plains and sand region, the transit of the most important commercial ways of Sogd and agriculture and the land owner (Dehghan / Dehkan) caused its prosperity.This paper tries to get through the effective factors in the existence and the developmental of these areas. And so, investigates about the history of its name and indication historical situation in morphology and existence of Sogdian cities.