Its defining feature is a circular earthen bank, just thirteen and a half metres in diameter, that encloses a shallow interior. The bank itself barely clears the surrounding pasture, standing no more than twenty centimetres on the interior side and fifteen on the exterior. Gorse has taken hold across both the bank and the enclosed ground within, softening whatever shape the monument once presented.

A ring barrow is a type of funerary monument, broadly prehistoric in character, in which a low circular bank and sometimes an accompanying ditch define a space associated with burial or commemoration of the dead. They are found across Ireland in varying states of survival, and many have been reduced over centuries by ploughing, grazing, and general agricultural activity. The example at Glenaglogh sits in pasture, which has at least spared it the worst of that attrition. Its modest dimensions are typical of the form, as are the gentle, almost imperceptible gradients of its earthworks. What makes it quietly compelling is precisely that understatement: the whole monument is barely a ripple in the ground, yet it represents a deliberate act of construction, a boundary drawn around a particular patch of earth, most likely for reasons connected with death and memory.