Iron was exported from the lower Naktong River in southeastern Korea to Wae (Japan) and Lolang. A fourth kingdom of Kaya in the far southeast (west of the Naktong River and current working day Pusan) exported high-quality stoneware pottery to Japan. Pottery manufacure flourished. The first Korean histories had been released, making use of movable kind, which led to the world’s initially casting of metal form in 1403.