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Even though development have been achieved in the researches on the history of (Ul-San)Hak-Seong by birthplace-historian since 1970's, only a few researchers have focused on original place of Hak-Seong. As a result, Ul-San Wae-Seong have been become mistakenly known to Hak-Seong by a part birthplace-historian. The Hak-Seng and Wae-Seong are two different things. But, at present, Hak-Seong have sank into obscurity because of the opinion that Wae-Seong is equal to Hak-Seong. These all result are caused by carelessness of study on old literatures of Hak-Seong. Accordingly, this paper deal with Hak-Seong which had been described in old literatures of Go-Ryeo and Jo-Seon dynasty. And, This study will clear up place-relation of two fortress through the investigation of old map. Ultimately, It will find out rough bounds of fortress through the search earth-surface of the supposed mountain of Hak-Seong.