In the Yayoi period in Japan, many moat settlements or citadel villages or upland settlements were built in high places, such as mountains, but declined with advances of political unity.
弥生時代の日本には、集落に濠をめぐらせた環濠集落や山などの高いところにつくられた要塞集落である高地性集落が数多く存在したが、政治的統一が進むにつれて衰退した。