[3] Yoshida-Kōriyama Castle is located in the Yoshida basin in northern Hiroshima prefecture, surrounded by the Chugoku Mountains.

The castle was initially built as a small fortification in the 14th century, by the Mōri clan, which descended from Ōe no Hiromoto, an important retainer of the Kamakura shogunate.

[4][7] It became quite advanced for a mountaintop castle (yamashiro), with complex inner and outer stone walls, a quadrangle and a stone-walled fort.

The Amago were decisively defeated in 1566, and Mōri Motonari ordered the further expansion and strengthening of Yoshida-Kōriyama Castle.

[6] The castle ruins are located about 15 minutes by car from Mukohara Station on the JR West Geibi Line.