is a mountain on the border of Shisà Â, Hyà Âgo Prefecture, and Mimasaka, Okayama Prefecture, Japan. It is the highest mountain in Okayama Prefecture and the third highest mountain in Hyà Âgo Prefecture, after Mount Hyà Âno and Mount Mimuro. In Hyà Âgo Prefecture this mountain is also known as Itabami-san and in Tottori Prefecture it is also known as Ushiro-no-sen.
Mount Ushiro is a fault-block mountain typical of the Chà «goku Mountains. This mountain belongs to the Hyà Ânosen-Ushiroyama-Nagisan Quasi-National Park. It is one of Hyà Âgo 50 mountains as well as one of Kinki 100 mountains and the Chà «goku 100 mountains.
Mount Ushiro is a center of Shugendà  in this region, and called Nishi-Omine, literally, West Omine. Omine is the name of the most important mountain for Shugendà  in Japan. According to a local narration in this area{fact}, this mountain was developed as a training area by En no Gyà Âja, the founder of Shugendà  in the 7th century, for Shugensha, practitioners of Shigendà Â. However, Dosen-ji, which is the center for the Shugendà  on this mountain, was established in the 13th century, so it would be natural to understand Shugendà  on this mountain also started about that time. Mount Ushiro is one of the mountains which still have some areas which women are prohibited to enter so as not to bother the training of Shugensha.