🇯🇵 Japan · Tumulus
Hashihaka Kofun
Early Kofun 280–300 CE (Yayoi → Kofun) · Yamato early Kofun (Makimuku–Hashihaka)
Hashihaka Kofun — first large keyhole-shaped kofun (zenpō-kōen-fun, c.280–300 CE) 280 m long, 30 m high on Makimuku plain Sakurai, excavated 1970s–2000s Shiraishi.