To-no-hetsuri is the largest scenic spot in Okawa Hatori Prefectural Park. It was designated as a national natural monument in 1943."Hetsuri” means a cliff or steep slope along a river in the local dialect, and the name ‘Tou no Hetsuri’ comes from the meaning of a steep cliff in the shape of a pagoda.Walking through the deeply gouged rock arcade, you will see strange and monstrous rocks towering like a huge stone tower.It is a magnificent landscape created by the million-year process of erosion and weathering of the Ookawa River (Aga River).In early summer, mountain hydrangeas hang down from the strange rocks, and in autumn, the leaves turn beautiful colors.