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CODIGO PONENCIA : 20112364ROHTAF TITULO PONENCIA : CATEGORIA PONENCIA : Ponencia CLASIFICACION TEMATICA : Degradación y desertificación de la tierra AUTOR PRINCIPAL : MOUSAZADEH FATEMEH ORGANIZACION : University of Malaya PAIS : Malaysia / Malasia Abstract BY: Fatemeh Mousazadeh PhD. Student in Geomorphology Department Of Geography Faculty of Arts and Social Sciences University Of Malaya Kuala Lumpur. Malaysia And Prof, Dr. Khairulmaini Osman Salleh Head of Department of Geography University of Malaya Kuala Lumpur. Malaysia Title: “Gully formation, processes and the influent factors on its extension in semiarid regions.” Gully erosion, is often associated as one of the most severe forms of soil erosion processes. The process is quite common in areas which are devoid of vegetation such as in the semi arid regions of the world but more recently gully erosion also predominates areas which are left abandoned after deforestation processes. The weather of each area is very important to make gullies and also geology and the type of soil has very important role in formation of gully erosion. Also it can happen by some digger animals such as rat and snake. Gully erosion often results in much displacement of the soil mass, culminating in sedimentation, and degradation of the land. Gully erosion have tremendous impacts on human activities which includes decreasing soil nutrients and agriculture productivity, river channel sedimentation and increasing floods and impact on water resources development within a river basin. Considering challenges faced in semiarid region, the study tries to evaluate all effective elements on formation and development of gullies or erosionsensitive area by performing applied and scientific studies. In order to achieve pre–determined goals, and providing great assistance for finding all the reasons in gully formation, the research examines two major objectives, which focuses on the processes of gully formation and the influent factors on extension of gully. The research hopes to provide better insights in understanding the evolution of gully erosion in semi arid regions. In this research we use GIS and Ilwis for preparing the maps, Excel for preparing the graphs and also Soil test as example in Toroud basin in Semnan-Iran. By considering importance of the subjects and with regard to the fact that studied region contains large and extensive gully which introduces potential hazard for croplands and habitats, and also make it difficult to pass through them, it is required to perform all possible actions which leads to bring an end to development and expansion of gullies. Key words: gully erosion, processes, formation and extension.