This one, in the townland of Letter in north Kerry, does the opposite. It sits quietly in low-lying ground to the north-west of Littor House, barely interrupting the flat agricultural landscape around it, which makes the fact of its survival all the more striking.

The fort is what archaeologists call a univallate rath, meaning it was enclosed by a single earthen bank rather than the two or three concentric rings found at more elaborate sites. That bank is still well preserved, rising to between half a metre and 1.8 metres on its exterior face and standing roughly a metre above the interior ground level. At its base it averages six metres in width, which gives a sense of the original effort involved in its construction. The enclosed area measures approximately 37 metres north to south and 36 metres east to west, making it a reasonably substantial example of its type. The interior slopes gently to the south-east. Raths of this kind were typically farmsteads of the early medieval period, roughly between the fifth and twelfth centuries, where a family and their livestock would have lived within the protection of the raised enclosure. The choice of low-lying ground here is slightly unusual and may reflect the particular drainage or agricultural character of the local terrain rather than any defensive calculation.