Sakato-yama Mountain, with a height in excess of 400 meters from its base, protrudes like a peninsula towards the place where the Uono-gawa River and the Mikuni-gawa River, both of which flow through the Muikamachi basin, meet.
坂戸山は、山麓との比高は400ｍを超え、六日町盆地を流れる魚野川と三国川の合流点に向かって半島状に突出している。