Mount Azumaya (四阿山, Azumaya-san) is one of the 100 Famous Japanese Mountains. The 2,354 m (7,723 ft) high peak lies, on the border of Nagano Prefecture and Gunma Prefecture. There exist alternative spellings of the mountain's name, like: 吾妻山 and 吾嬬山 which is read as "Agatsuma-yama" (Mount Agatsuma).