長崎鼻古墳

長崎鼻古墳 is a keyhole-shaped burial mound on the ridge at 長崎ノ鼻, at the tip of 屋島, which projects into the Seto Inland Sea in northern 高松市, 香川県. The mound lies at an elevation of about 55 meters and forms part of the nationally designated historic site and natural monument “屋島.”

The mound is 45.8 meters or 45 meters long, with a three-stage rounded rear section measuring 28 meters across and 5 meters high. Its front section is also built in three stages, measuring 20 meters wide and 3.6 meters high. Stone facing remains on the mound, while no clay figures were found. A vertical stone chamber in the rear section contains a hollowed boat-shaped stone coffin made from Aso volcanic tuff.

The burial is estimated to date from the early 5th century, within the wider period 250 CE to 650 CE. It was disturbed by unauthorized digging in the early Meiji period and investigated in 1997-1999 during the basic survey of 屋島. The coffin is thought to have been made in the 菊池川 basin of northern 肥後地方, suggesting broad connections. Its unusual location, orientation and carefully built stone facing distinguish it from other 香川県 burial mounds.

Monuments of this kind in Japan are known as kofun, the great burial mounds built mainly between the middle of the third century and the early seventh century CE. They take their name from this tradition. The distinctive keyhole-shaped form has a square front and a round rear when seen from above, but plain round, double-rectangle and square mounds also occur, and their orientation varies.

長崎鼻古墳 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 "長崎鼻古墳", shown in the original language.