Oumakiichigoukohun

Oumakiichigoukohun, formally called 大牧1号墳, is a megalithic burial mound in 岐阜県各務原市鵜沼大伊木町4丁目425, within the grounds of 各務原市立陵南小学校. It belongs to the 大牧古墳群 and is the most completely preserved mound in that group. Its location is on the northern edge of a plateau projecting toward 木曽川.

The monument is a keyhole-shaped 前方後円墳. Excavation in 1982 indicated that most of the mound was made by cutting into the natural ground and forming a circular mound approximately 30 meters in diameter. A discontinuous moat about 5 meters wide ran around its northern, eastern and southern sides. The total length was 45 meters.

Inside is a horizontal stone chamber opening to the south, measuring about 4.5 meters deep, 2.5 meters wide and 3.5 meters high. It contained a 凝灰石製组合式家形石棺 measuring about 2.4 meters long and 1.3 meters high. Finds included weapons such as 直刀, 鉾 and 鉄鏃; horse equipment including 轡, 鐙 and 杏葉; and ornaments such as glass beads, gold-loop earrings and silver hollow beads.

Oumakiichigoukohun is dated by typological estimate to 250 CE to 650 CE. Its mound and stone chamber, together with the grave goods, suggest that the buried person belonged to a powerful local clan whose sphere of influence extended along 木曽川. It has been a 各務原市指定文化財 since 1984年（昭和59年）6月26日. Access is through 各務原市立陵南小学校 by prior reservation.

Oumakiichigoukohun is a megalithic mound (tumulus with integral stones) in Japan. A typological estimate: 250 CE to 650 CE. No English Wikipedia article exists for it; the full text below is the Japanese article "大牧1号古墳", shown in the original language.