Giant man-made structures dominating steep canyons, dams are a common feature of Japan's mountainous landscape. Dams provide water, prevent floods and generate hydroelectric power. But all this can come at a cost, with communities submerged and ecosystems disrupted. This time on Japanology Plus, our topic is dams. Our expert guest is Saki Miyajima, a dam aficionado who runs a website called Dam Mania.