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Site of Shimizuyama Castle

Shimizuyama Castle was a long, narrow stronghold built in the late sixteenth century along the ridge of Mt. Shimizu above what is now the town of Izuhara. The fortress was likely intended to complement the defenses of Kaneishi Castle at the foot of the mountain in the event of a visit by the warlord Toyotomi Hideyoshi (1537–1598), who was planning to invade the Korean Peninsula at the time.

By the early 1590s, Hideyoshi had defeated all his domestic rivals and unified Japan, after which he planned the conquest of Ming China by way of Korea. The invasion forces were to depart from Iki and Tsushima, and Hideyoshi ordered his lieutenants to establish footholds on the islands to accommodate a force of 150,000. Each of these bases was to include a castle from which Hideyoshi could personally oversee the campaign. In Izuhara that would have been Kaneishi Castle, the stronghold of the So family, administrators of Tsushima.

Shimizuyama Castle was built to overlook Kaneishi Castle. It consisted of three enclosures built on flattened terraces—two along the mountain’s ridge and one on the 206-meter-high summit—and a connecting corridor that spanned a length of 500 meters. The terraces were reinforced with stone ramparts. The first and third enclosures have been relatively well preserved, and the ruins of their entrances and walls are clearly visible on the mountain. Both are accessible via a hiking trail that ascends to the third enclosure and follows the ridge from there. The site of the third enclosure (sannomaru), around 100 meters above sea level, provides a view over the modern town and port of Izuhara.

清水山城遺址

清水山城是位於清水山山脊之上的一座狹長形要塞，俯瞰著如今的嚴原町，其遺址已被指定為國家史跡。要塞建於16世紀晚期，當時，武將豐臣秀吉（1537-1598）正計劃出兵朝鮮半島，清水山城很可能是為了迎接他的到來，配合山腳下金石城的防禦體系而建。

1590年代早期，豐臣秀吉擊敗國內所有對手統一了日本，隨後他打算透過朝鮮半島征服中國明朝。遠征軍將從壹岐和對馬渡海出發，豐臣秀吉命令家臣在島嶼上建立據點，以容納15萬大軍，同時，每一處據點還要修築一座讓他可以親自督戰的城防要塞。在嚴原，統治對馬的「宗」家根據地「金石城」就是其中一處。

清水山城可俯視金石城，由三段防禦區構成，其中兩處沿山脊而建，一處位於206公尺高的山頂，從上至下分別被稱為一之丸、二之丸和三之丸。從金石城遺址到清水山城的三之丸遺址有一條登山道相連。三之丸海拔約100公尺，可以俯瞰嚴原町中心部和港口。從三之丸遺跡沿著山脊有一條大約500公尺長的徒步小道通往另兩處防禦區，道旁均築有石壁加固。一之丸和三之丸這兩處遺址保存相對完好，其入口和石牆清晰可辨。

清水山城遗址

清水山城是位于清水山山脊上的一座狭长形要塞，俯瞰着如今的严原町，其遗址已被指定为国家史迹。要塞建于16世纪晚期，当时，武将丰臣秀吉(1537-1598)正计划出兵朝鲜半岛，清水山城很可能是为了迎接他的到来配合山脚下金石城的防御体系而建。

16世纪90年代早期，丰臣秀吉在击败了国内所有对手统一日本之后，计划通过朝鲜半岛征服中国明朝。远征军将从壹岐和对马渡海出发，丰臣秀吉命令家臣在岛屿上建立据点以容纳15万大军。每一处据点还要修筑一座能让丰臣秀吉亲自督战的城防要塞。在严原，统治对马的“宗”家族根据地“金石城”就是其中一处。

清水山城可俯视金石城，由三段防御区构成，其中两处沿山脊而建，另一处则位于206米高的山顶，从上至下分别被称为一之丸、二之丸和三之丸。从金石城遗址到清水山城的三之丸遗址有一条登山道相连。三之丸海拔约100米，可以俯瞰严原町中心部和港口。从三之丸遗迹沿着山脊有一条大约500米长的徒步小道通往另两处防御区，道路旁均筑有石壁加固。一之丸和三之丸这两处遗址保存相对完好，其入口和石墙清晰可辨。