Japanese castles in Korea

Japanese Castles in Korea (Korean: 왜성; Hanja: 倭城; RR: Waeseong; Japanese: 倭城, romanized: Wajō, Wesōn) are Japanese castles built by the armies of Toyotomi Hideyoshi along the southern shores of Korea during the Imjin War (1592–1598). Japanese castles in Korea can be classified into two categories: castles built to secure supply lines for Japanese forces moving throughout Korea, and castles built primarily along the southern coast of Korea to serve as seats of governance.

Source: Wikipedia — Japanese castles in Korea (CC BY-SA 4.0)