The Dongnaeeupseong Fortress is located on Dongnae-gu, Busan Metropolitan City, Republic of Korea. Traditionally In Korea, a wall-fortress was erected in each town to keep it safe from invasions. In this area called Dongnae, there were some borough-states after the Samhan period (the 1st century BC), Geochilsanguk, Chilsanguk, Jangsanguk and Dongnoguk states are told to have been included among these. It is believed that walls had been already built here at that time.