, commonly referred to as simply Tateyama, is a mountain located in the southeastern area of Toyama Prefecture, Japan. It is one of the tallest mountains in the Hida Mountains at and, along with Mount Fuji and Mount Haku, it is one of Japan's . Tateyama is a term for the mountain consisting of three peaks: Ōnanjiyama (大汝山, 3,015m), Oyama (雄山, 3,003m), and Fuji-no-Oritateyama, (富士ノ折立, 2,999m) which run along a ridge (see photo). Tateyama is the tallest mountain in the Tateyama Mountain Range (立山連峰, Tateyama-renpō).