A cist is a small stone-lined burial box, typically just large enough to hold a crouched human body, constructed from carefully placed slabs and then covered over. They date most commonly to the Early Bronze Age, roughly 2500 to 1500 BC, and were used by communities who buried their dead individually, sometimes with a ceramic vessel or a few grave goods tucked alongside the body. Finding one in the landscape today is a reminder that the ground beneath ordinary Irish fields has been in use, in one sense or another, for a very long time.

Bellanasally sits in the west of Mayo, a county whose boglands and upland terrain have preserved an unusually dense concentration of prehistoric remains, from megalithic tombs to standing stones to field systems that predate recorded history by millennia. Cists in this region were often sited deliberately in the landscape, sometimes on elevated ground or near earlier monuments, suggesting they were not simply practical solutions to the problem of disposal but carried some meaning in how and where the dead were placed. The specific circumstances of this particular cist, its dimensions, its orientation, whether any grave goods were recovered, and how it came to be recorded, remain details that have not yet been made publicly available.