The fort takes its name from that well: Toberaspagher, a name rooted in the Irish for a holy or notable spring, and the well was considered handsome enough in its own right to define the entire enclosure around it. That is an unusual inversion. Raths, the circular earthen enclosures built during the early medieval period and used as farmsteads or defended homesteads, are typically named for families, landmarks, or saints. Here, the water source came first.

The enclosure measures roughly 35 metres in diameter, placing it comfortably within the typical range for a rath of its kind. It appears on the Ordnance Survey six-inch map of 1846 under the name Toberaspagher Fort, though by the 1894 edition the cartographers had added the telling parenthetical "Site of", suggesting the earthworks had already deteriorated considerably in the intervening decades. What remains today is a low rise along the western arc of the bank, and part of the original circuit may have been absorbed into a later field boundary at the eastern side, a fate common to many raths across Ireland as agricultural land was reorganised over the centuries. Beneath the enclosure there is a possible souterrain, an underground stone-lined passage or chamber that would have served early medieval inhabitants as storage space or a place of refuge. The rath sits in pasture on a gentle slope overlooking the valley of the Glanooragh River, a position that would have offered both practical drainage and a clear view southward.