One side of the basin is limited by a fault, and the Katsura-gawa River (Yodo-gawa River system) traverses the central part of the basin, but, since the ground of the southern part where the urban area is located is comparatively low, the urban area of Kameoka City is flooded easily when the river water increases.
断層角盆地で、中央を桂川(淀川水系)が横断するが、どちらかというと市街地のある南側の地盤が低いため、ひとたび川が増水すると、亀岡市街地は冠水しやすい。