The togher at Derryoghil is a bog road, a structure made not from stone or gravel but from carefully laid timber, constructed to carry people across the soft, treacherous ground of an Irish raised bog. Toghers are among the more quietly remarkable survivals in the Irish archaeological record: wooden trackways, often prehistoric or early medieval in date, that endured only because the waterlogged, oxygen-poor conditions of the bog prevented the wood from rotting away entirely.

This particular example runs roughly east-northeast to west-southwest and extends some 27 metres in length, with a width of 3.2 metres and a thickness of around half a metre. That combination of dimensions places it in the class 2 category of togher construction, reflecting a degree of structural investment beyond the most rudimentary. The builders worked with large brushwood and roundwood laid longitudinally, transversely, and diagonally, with occasional smaller brushwood filling gaps and adding stability. The layering of timber in multiple directions is not accidental; it distributes weight and resists the shifting pressure of the bog beneath. The result is something closer to engineered infrastructure than an improvised path, suggesting the crossing it served was well used and worth maintaining.