河内国
was a Japanese castle, constructed in 1332 by Kusunoki Masashige. Consisting primarily of wooden and earthworks defenses, Chihaya stands as a keen example of fortress design of Japan's Nanboku-chō period. Located on Mount Kongō in Kawachi Province, it survived a siege in 1333, but was later conquered by forces of the Ashikaga shogunate in 1390 and then abandoned.