抄録
In this paper, we discussed the planning of area cooperation based on the endogenous development theory on the field of Kuroisocity, Nasu-town and Kurobane-town in the northeast of Tochigi prefecture. According to the opinion of residents for area development and using regional resources, this district can be considered "the water cycling country".Besides that, it is possible to be divided into three parts, such as "yielding part", "collecting part", "streaming part"by geographical features, and extracted activities that will be done by residents of each part. As the result, it can be assert that the area cooperation is to be based on the endogenous development theory, and by organizing the proper concept, that is also effective on the sustainability of the world.