With respect to areas outside the Japanese Archipelago, the recent research by Korean archeologists has revealed presence of the keyhole-shaped tumuli that seem to have been constructed in the fifth and sixth century in the southern and southwestern Korean Peninsula, which is considered to have been under the control of Wa (the oldest recorded name for Japan).
日本列島以外では、近年韓国における考古学者の研究によって倭の支配を受けていたと見られる朝鮮半島南部から南西部にかけて5、6世紀に建造されたと見られる前方後円墳の存在が明らかになっている。