Andonyama Tumulus is the second largest tumulus next to Shibutani Mukouyama Tumulus (currently designated as the Imperial Mausoleum of Emperor Keiko) among Yamato/Yanagimoto Tumulus Group scattered around the foot of Miwa-yama Mountain, and it is now specified as the Imperial Mausoleum of Emperor Sujin (Yamanobeno Michinomagarino Okanoeno Misasagi).
三輪山の山麓に築かれた大和・柳本古墳群の中でも、渋谷向山古墳（現景行天皇陵）に次ぐ大きさであり、現崇神天皇陵（山辺道勾岡上陵）に比定されている。