A rath, as this type of ringfort is commonly called, is an early medieval farmstead, typically dating from roughly the sixth to the twelfth century. The bank and ditch enclosing the interior would have protected a family and their livestock from wolves and opportunistic neighbours rather than from any organised military threat. Ireland has tens of thousands of such sites, yet each one represents a specific household, a specific decision to settle a particular patch of ground, and Mweennalaa has one of its own.

Raths are among the most numerous field monuments in the Irish countryside, and Kerry has a notable concentration of them scattered across its peninsulas and upland fringes. The placename Mweennalaa itself is likely derived from Irish, as most Kerry townland names are, carrying in its syllables some older description of the land, perhaps a reference to a bog, a hill, or a local feature that mattered to the people who named it. The enclosure would originally have contained a timber or drystone house, outbuildings, and perhaps a souterrain, an underground stone-lined passage used for storage or refuge. Over centuries, the interior was abandoned, the structures decayed, and the site became simply a raised or hollowed feature in a field, recognisable to those who know what to look for but easy to pass without noticing.

Kerry's farming landscape has preserved many such earthworks largely because the ground was never subject to the intensive deep ploughing that erased so many ringforts in the midlands and east of Ireland. Mweennalaa sits within that broader pattern of survival, a small circular statement of early medieval life in a county where such things have a habit of enduring.