The appearance of Square in Northwest Iran, as a traditional element of the city, did not have a certain definition in the urban planning due to its structural disruption in the spatial fabric as well as its chaotic present in the manifestation of its identity. On the other hand, since the concept of the square in this area does not match to the similar models existing in the central plateau of Iran including the characteristics of being enclosed and architectural integrity, most researchers have assumed that the irregularity of the form in the squares of northwest Iran is because of gradual growth, lack of spatial desirability, and performance without a predesigned plan. This descriptive-analytic research studies the effect of climate on the formation of the structural layout of "Saheb Abad" Square as a case study. In this way, a specified framework would be suggested, and a fixed sustainable urban pattern would be achieved regarding the form of a square in modern urbanism in this region. According to the findings of this study, the disintegrated layout of the square in Northwest Iran is not only because of its structural weakness, but it was in certain parallels with environmental and natural conditions. It is obvious that the investigation of this innovation could lead to sustainable development in modern urban constructions.
