It measures roughly twelve and a half metres north to south, eight metres east to west, and rises only about sixty centimetres above the surrounding terrain. Unassuming as it is, it belongs to a category of site that archaeologists find quietly fascinating: the burnt mound, known in Irish as a fulacht fiadh. These are among the most common prehistoric monuments in Ireland, typically dating to the Bronze Age, and they represent the accumulated debris of a repeated cooking or heating process. Stones were heated in a fire, dropped into a water-filled trough to bring the water rapidly to the boil, and then discarded once they cracked and became unusable. Over generations of use, the shattered, fire-reddened stones built up into the characteristic mound shape.

The Lissooleen example appears to be filled predominantly with stone rather than the charcoal-rich material that sometimes dominates such sites. Its trough area, the hollow where water would once have been held, opens to the east and measures three metres north to south by three and a half metres east to west. That eastward orientation is a detail worth noting, though what practical or habitual reasoning lay behind it is now impossible to say with certainty. The site was recorded during a survey of the Lee Valley area carried out in 1996 and 1997, placing it within a broader landscape of prehistoric activity along that river corridor in Kerry.