The rath at Baile An Tsagairt breaks that convention entirely. It sits on flat, marshy ground beside Trabeg, hemmed in by the kind of waterlogged terrain that makes any construction effort considerably more demanding. That choice of location is itself worth pausing over.

What survives is a bivallate rath, meaning it is defended by two concentric banks and ditches rather than the single circuit more commonly encountered. The inner bank rises roughly two metres above the fosse, the ditch cut between the two rings of earthwork, and the outer bank matches that height above its own surrounding ditch, which drops about one and a half metres below the surrounding ground level. Between the two banks, the inner fosse runs five metres wide, a substantial obstacle. The entrance faces southeast, and just inside it, close to the threshold, there is what appears to be a well. A third earthwork skirts the southern side of the enclosure, though this is thought to be a later field boundary rather than an original defensive feature, added at some point after the rath itself fell out of use. The inner face of the interior bank has been considerably disturbed by rabbit burrows and badger setts, which says something about how thoroughly the site has been left to its own devices. The description comes from J. Cuppage's 1986 archaeological survey of the Dingle Peninsula, Corca Dhuibhne, one of the more thorough regional surveys of its kind, which catalogued hundreds of such monuments across this densely layered stretch of southwest Kerry.