Roi-et City is located at the northeastern part of Thailand with an area of 11.63 square kilometers and a population of 56,100 and population density of 4,824 persons per square kilometer. The main policies of the city are first, establishing suitable solid waste management, which involves collection, transfer, and sanitary disposal as well as reduction of solid waste creation from communities and fostering responsible reuse. Secondly, promotion of quality of life with public education on sustainable development. Thirdly, management of green areas and green space access.