ABSTRACT: Rapid growth of population, urbanization and industrialization are known as the most importantelements that constitute environmental problems. One of the most important environmental problems inour country is the problem originated from solid wastes, and also garbage amounts increases with theincreasing population. The need for the landfill areas is important for the environment and human healthin our country like in the developed countries. In this study, detailed geological and hydrogeologicalinvestigations were carried out to determine the solid waste landfill area in old clay mines in the city ofKırıkkale, Bedesten locality chosen from the alternative areas. The main lithology of the landfill areaconsists of CL-CH soils belonging to the İncik and Kızılırmak formations. The site is preferred because theselected landfill site is an old clay mine, practically impervious, easy to drain the leaking water andrequires no extra excavation cost.