Invisible to anyone walking the fields of Mullaghreelan today, two ancient trackways survive only as shadows in the soil, readable from the air but otherwise lost to ordinary sight. These are cropmarks, the faint but telling variations in vegetation that appear above buried features when dry conditions stress growing crops unevenly. Where old ditches, or fosses, were once cut into the ground, soil disturbance and moisture retention cause crops above them to grow slightly differently, producing lines and patterns that become legible only from altitude.

Aerial photography revealed two pairs of fosses at Mullaghreelan, each pair defining a separate trackway and running roughly east to west, with the two routes lying approximately 150 metres apart. The northern trackway is the more evocative of the two. Running an estimated maximum length of around 300 metres, it connects a wooded area to a known enclosure site, suggesting it once served a deliberate and probably habitual purpose, linking somewhere sheltered to somewhere bounded. Enclosures in an Irish prehistoric or early medieval context were typically defined spaces, often circular, used for settlement, agriculture, or the management of livestock. The trackways at Mullaghreelan fit a pattern well documented elsewhere in Ireland, where paired ditches flanked a routeway and kept it defined against the encroachment of vegetation or animals. What is unusual here is that both routes survive with enough buried coherence to register together in the same field of view, their parallel courses implying either simultaneous use or a landscape that was organised and reused across time.