According to History of Three Kingdoms(三國志), Nakdong River was the point of provenance for voyage to Japan and also the gateway to Korean peninsula for Japan archipelago people. Tsushima(對馬島) and Iki-sima(壹岐島), or Okisima(沖の島) were the stepping stones between Korea and Japan. Using this sea-route, various people were coming and going with frequency. The typical examples are Talhae(脫解), Hogong(瓠公), Tsunuagarashito(都怒我阿羅斯等), Amenohiboko(天日槍), Sotsuhiko(襲津彦). Someone were immigrants and the others were aggressors. Among them, Talhae is famous as one progenitor of three royal families in Silla. He was recorded to be born from big egg in Dapana(多婆那國) or Dragon castle state(龍城國). This state which was located 400km northeast of Wa(倭) can be speculated Tanpa(丹波) area in Japan archipelago. This area leaded other areas in producing C-type jadeite(曲玉) and using iron tools. Jadeite was found only from Itogawa(?魚川) in Niigata province(新潟縣) on west coast of Japan archipelago during ancient times, and C-type jadeite decorating the crowns excavated from Silla tombs. These jadeites seem to be produced in Tanpa area. The sea-route from the mouth of the Nakdong River to Tanpa can be called as Iron Road or Jadeite Road. Tsunuagarashito reached to Tsunuga in Hukui Province(福井縣) using this route.