The example at Drombrow, on the south bank of the Mealagh River in County Cork, applies precisely the same logic to an inland river setting. A wedge of ground jutting out above the water acts as the natural barrier, while whoever built here concentrated their efforts on defending the one approachable end.

The site was recorded by Seamus Crowley of the Mallow Field Club, who mapped out its geometry in some detail. The promontory itself measures roughly 32 metres north to south, narrowing from about 33 metres wide at its southern base to just 9 metres at its northern tip. That raised northern end, a platform some 7 by 8 metres, is where the defences are most concentrated. Immediately to its south lies a deep, wide trench, and beyond that, two further bank-and-ditch entrenchments step outward in sequence. This layered arrangement, multiple earthworks stacked one behind the other across the accessible approach, would have made any direct assault a slow and costly business. The river itself did the rest of the work on the remaining sides. The entire site is now covered by natural woodland, which has likely both preserved the earthworks and made them considerably harder to read from ground level.