🇯🇵 Japan · Megalith
Oshoro
Jomon Mid–Late 2500–1800 BCE (Hokkaido) · Jomon Hokkaido (Oshima–Shakotan)
Hokkaido Jomon stone circle (2500–1800 BCE) at Oshoro Otaru — 30 m with 47 boulders and Fusen rock art above Oshoro Bay.
🇯🇵 Japan · Megalith
Komakino Stone Circle
Late to Final Jomon (2300–400 BCE) · Late Jomon (Tsugaru region)
Late Jomon megalithic cemetery (c.2300–1700 BCE) on Hakkoda foothills in Aomori City — massive ring-ditch stone circle 35 m dia.
🇯🇵 Japan · Megalith
Omori Katsuyama Stone Circle
Late Jomon (2000–1000 BCE) · Late Jomon (Tsugaru–Iwaki region)
Late Jomon double stone circle (c.2000–1500 BCE) at the foot of Mt. Iwaki near Hirosaki, Aomori — two concentric andesite rings 48 m and 29 m diameter, with 77 standing stones up to 1.5 m high…
🇯🇵 Japan · Megalith
Isedotai Stone Circles
Late Jomon (2000–1000 BCE) · Late Jomon (northern Tōhoku)
Late Jomon ritual stone complex (c.2000–1700 BCE) at Kitaakita, Akita — four large stone circles (largest 45 m dia.) with 200+ river cobble andesite arrangements, sunken pit structures, and adjacent…
🇯🇵 Japan · Megalith
Oyu Stone Circles
Late Jomon 2000–1500 BCE · Jomon Late
Twin Late Jomon double-stone circles (2000–1500 BCE) — Manza (46 m dia) and Nonakado (42 m dia) placed either side of prefectural road at Oyu, Kazuno, each concentric with sundial-like 2.1 m central…