Japanese castles were built on the Korean peninsula during the Bunroku-Keicho War in order to serve as headquarters for the invading daimyo (Japanese feudal lords), and many of these were constructed near to shorelines and rivers in order to secure landing sites for supply ships from Japan.
文禄・慶長の役において、大名たちの侵攻の拠点として朝鮮半島に倭城が築かれたが、その多くは日本からの補給口となる船着場を確保するため、海岸や河川に近いところであった。