【Designated by the City：Historic Site】Susabimyaka (Gigantic Tomb)

Located 340 m east of Irabu, the tomb is considered to have been built in around 1600. Among other existing Myaka in Irabu, it is the largest tomb, and has is made with superb stonemasonry.The peripheral stonemasonry is double-framed. The outer wall is a pile of large rocks of Tatami mat size, measuring 10.8 m east-west, 7.2 m north-south, and 1.8 m in height.
The inner stonemasonry and two walls are a fine alignment of large rocks of 20 cm in thickness. The inner stone wall is about 30 cm higher than the outer stone wall.
The coffin consists of four wall stones, a bottom stone, and a cover stone, all of which are single flagstones. The coffin is 90 cm wide, 1.5 m long and 75 cm deep, internally. There is a space at a joint between the bottom stone and wall stone so that water or dirt will not remain in the coffin.
Although the cover stone is relatively soft, metal (iron) tools apparently were needed to process it. The site is important in understanding the masonry at that time.