 Majoseon was located on the Korean peninsula, Jinjoseon was located in Manchuria, and Beojoseon was located around Liaoning.Gojoseon was developed in the time of bronze wares, and continued to the Iron Age.The territory of the three Gojoseons is recognizable by the occurrence of their unique style of bronze sword, i.e., the mandolin-shaped dagger (비파형동검, 琵琶形銅劍).