Tanbara Dam (玉原ダム, which can be mistakenly read Tamahara Dam[1]) is a rock-fill embankment dam impounding the headwaters of the Hotchi River, a Tone River tributary in Gunma Prefecture of Japan. It is located 14 kilometres (8.7 mi) north of Numata. It creates the upper reservoir for the 1,200 megawatts (1,600,000 hp)