Koseyama-kofun Tumuli Cluster is a largest-class cluster of tumuli clusters in Japan with approximately 700 tumuli being built on the hilly land of Mt. Kose in Gose City, Nara Prefecture from around the middle of the Kofun period (Tumulus period) to the end of the period.
巨勢山古墳群（こせやまこふんぐん）は、古墳時代中期中葉から終焉期にかけて、奈良県御所市の巨勢山丘陵に約700基が築かれた国内最大級の群集墳である。