Nagaune Kofun Cluster

Nagaune Kofun Cluster is a group of four burial mounds at 岡豊町, 南国市, 高知県, Japan. It lies on a ridge at an elevation of 62 meters. Three mounds were excavated as an emergency archaeological investigation from June to December 1994 during construction of 高知自動車道; 長畝1号墳 lay outside the investigated area.

The cluster contains mounds from different periods, with three phases of use identified. 長畝2号墳, dated to the latter half of the 4th century, has two burial structures, including a 竪穴式石槨 made from split 礫岩 and a second chamber with a 粘土槨 and fitted wooden coffin. 長畝3号墳, probably from the latter half of the 5th century, has a 竪穴式石室, the first of its kind detected in 高知県.

長畝4号墳 dates to the second quarter of the 6th century and has a round mound, 周溝, an early 横穴式石室, and features associated with 墓前祭祀. Finds included 須恵器, 36 鉄鏃, 41 beads, 銀製耳飾り, iron tools, 馬具, and three 刀子. Its 墓前祭祀 continued from the late 6th century to the beginning of the 7th century.

The three excavated mounds were moved about one kilometer to the northeast when 高知自動車道 opened. They now form 長畝古墳公園, where examples from the early, middle, and late periods of the kofun era can be observed together. The cluster is not designated as a 史跡. Such monuments in Japan are great burial mounds, often built between the middle of the third century and the early seventh century CE; besides keyhole-shaped mounds, they include round, double-rectangle, and square forms.

Nagaune Kofun Cluster is a megalithic mound (tumulus with integral stones) in Nankoku, Japan. Wikidata describes it as: kofun in Nankoku, Kōchi, Japan. A typological estimate: 250 CE to 650 CE. No English Wikipedia article exists for it; the full text below is the Japanese article "長畝古墳群", shown in the original language.