A fulacht fia typically survives as a horseshoe-shaped or kidney-shaped mound of fire-cracked stones, usually found close to a water source. The standard interpretation is that they were cooking sites, where stones were heated in a fire and then dropped into a water-filled trough to bring it to boiling point, though alternative theories have proposed uses ranging from textile processing to bathing. The burnt, shattered stones, discarded after each use, are what built up the mound over time.

Knocknalappa itself is a townland in Clare, a county with a dense concentration of prehistoric activity, from the limestone karst of the Burren to the wetland margins of Lough Derg and the River Shannon. Fulachtaí fia in Ireland date broadly to the Bronze Age, roughly 1500 to 500 BC, though some examples have produced earlier or later dates. Their clustering near boggy ground and streams means they are often low-lying and unassuming, easily walked past without a second glance. The Knocknalappa monument fits into this wider landscape pattern, a Bronze Age feature in a county whose waterlogged and limestone terrain has preserved an unusual range of ancient remains.