Itsukahara Kofun

The mound stands on a ridge of the southern part of the Mukō Hills, on the southwestern edge of the Kyoto Basin. Several other large keyhole-shaped tombs lie in the Mukō Hills and are collectively known as the Mukō Hills Kofun cluster. Part of the northwestern base of the circular mound has been levelled by residential development, but the mound remains in good condition overall.

The tomb is a zenpō-kōen-fun (前方後円墳), a form with one square end and one circular end when seen from above. It is orientated to the south and is mostly made of piled earth, with two tiers in the front and three tiers in the rear. Its surface is covered by fukiishi roofing stones, but no haniwa have been found. Its total length is 91.2 metres. The anterior rectangular portion is 33 metres wide and 4.0 metres high, and the posterior circular portion has a diameter of 55 metres and a height of 8.7 metres.

The burial facility is a pit-type stone burial chamber at the top of the posterior circular section, made entirely of natural river stones. It measures 6.2 metres long and 1.3 metres wide and, although its interior has not been investigated, it is estimated to be more than 1.5 metres deep. Electrical surveys before the excavation had suggested a further burial pit in the centre of the anterior rectangular portion, but excavation failed to find physical evidence of it. One clay coffin was discovered at the western foot of the rear mound.