青塚古墳 (香川県)

青塚古墳 is a mid-period Kofun mound in 観音寺市, 香川県, Japan. It is estimated to date to the middle of the 5th century and takes the form of a 帆立貝形古墳, a mound with a round rear section and a projecting front section. Its estimated main-axis length was approximately 60 meters.

The front section has disappeared, leaving only the round rear portion, now about 43 meters in diameter. Traces of the surrounding moat have also been confirmed. The mound has an underground stone chamber containing a hollowed-out boat-shaped stone coffin made from Aso welded tuff.

A similar boat-shaped stone coffin has been identified at 丸山古墳, another round mound in 堂本町 within 観音寺市, also made from Aso tuff. A survey by 徳島文理大学文学部文化財学科 also confirmed that 御厨天神社古墳 in 高松市, dating from the latter part of the 5th century, has a 帆立貝形 form.

青塚古墳 was designated a historic site by the former 観音寺市 on 1970年（昭和45年）3月12日 and remained a municipal designated historic site after the creation of the new 観音寺市 in 2005年（平成17年）. Its management body is 厳島神社, and a torii still stands before the mound, which forms part of the sacred precinct.

青塚古墳 (香川県) 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 "青塚古墳 (観音寺市)", shown in the original language.