Though there is a lot of greenery even in the heart of Tokyo, from public parks to riverbanks, there remains only one natural gorge: the Todoroki Valley in Setagaya City. Carved by a river of spring water eroding layers of soft loam, the Todoroki Valley runs about half a mile through an upscale residential district, crossed over by the Kanpachi road at one point. The trail below traces the gentle curves of the stream, covered with a thick copse of trees on either side, a serene sylvan scenery somewhat atypical…
