It is a rath, the Irish term for a ringfort, the most common type of monument to survive from early medieval Ireland. These were typically enclosed farmsteads, home to a single family or small community, defined by one or more earthen banks and ditches thrown up not so much for military defence as for the practical business of keeping livestock in and wolves out.

Ringforts were built and occupied roughly between the fifth and twelfth centuries, and Ireland once held tens of thousands of them. Many were levelled by agricultural improvement, particularly during the eighteenth and nineteenth centuries, though a deep-rooted folk belief that they were the dwelling places of the fairy folk, the sí, preserved a remarkable number from the plough. Whether the one at Carrowblough More survived through superstition, inconvenience, or simple luck is not recorded. Clare is a county with a dense concentration of these monuments, its landscape of thin soils and limestone giving way to the kind of marginal ground that early farmers worked hard to make productive and later farmers sometimes left alone.

The townland name itself is worth a moment. Carrowblough derives from the Irish An Cheathrú Bhuí, meaning the yellow quarter, a reference to land division rather than colour in any decorative sense. The quarter, or ceathrú, was a traditional unit of land in Gaelic Ireland, and townland names preserving such terms are a quiet record of how agricultural ground was once measured and distributed. The rath sits within this named parcel of land, anonymous in its particulars but very much part of a broader pattern of early settlement across the west of Ireland.