Overgrown and roughly a metre high, it measures fifteen metres in both length and width, the kind of quiet hump in a field that most people would walk past without a second glance. What it actually represents is one of the most common yet consistently puzzling monument types in the Irish archaeological record.

A fulacht fia, sometimes called a burnt mound, is the remains of a prehistoric cooking or processing site. The typical arrangement involved a timber trough sunk into the ground near a water source, filled with water, and heated by dropping fire-cracked stones into it. Those stones, once spent, were piled to the side, and over centuries of repeated use the discarded material accumulated into the characteristic horseshoe-shaped or oval mounds that survive today. The Aglish example sits close to a stream, which would have supplied exactly the kind of constant water access these sites required. What makes its location particularly interesting is that another fulacht fia lies roughly a hundred metres to the west, suggesting this stretch of streamside ground was returned to repeatedly, perhaps across generations. Whether the two sites were ever in use simultaneously, or represent activity separated by long intervals, is the kind of question the mound itself cannot answer.