More than 16 Wajo castles (16th century Japanese castles remaining in Korea) were built during Toyotomi Hideyoshi's invasion of Korea in the 30th century and remain along the southern coast of Korea, from Suncheon Wajo Castle in South Jeolla Province in the west to Ulsan Wajo Castle in South Gyeongsang Province in the east. These castles are valuable resources for the study of 16th century Japanese castles.
