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Fast-growing population, climate change and increase in the residential area are causing a decrease in Turkey's agricultural land. This has led people to find different areas of production or to increase the quantity of products taken from the unit area. The way to continue production for 12 months is to increase greenhouse areas. In recent years, greenhouse production activities in Turkey have become a preferred agricultural sector, due to the government support and the private companies' interest in this subject.

The study covers 4 provinces (Izmir, Manisa, Usak and Kutahya) of the Gediz basin. In this study, it has been tried to determine suitable places for greenhouse activities in the study area by using Multi criteria Decision Analysis (MCDA) method and GIS. In the selection of greenhouse location; land use, climate, soil, wind, altitude, slope, aspect and the distances to the geothermal sources are important. A Geographic Information System (GIS) -based Multi-criteria evaluation for greenhouse site selection were applied in 4 provinces (Izmir, Manisa, Usak and Kutahya) of the Gediz basin using these data. The suitable, nonsuitable or partially suitable areas for greenhouse siting in the basin were determined in terms of GIS, for guidance to producers and researchers in the future. In the study, it is foreseen that, if the geothermal water is used in greenhouse heating, the energy costs of greenhouses and the impact of the geothermal waters on the environment will be reduced.