What survives instead is the earthwork that once enclosed it: a low rectangular platform defined by a bank and an external fosse, the kind of defensive ditch that would have been a standard feature of a late medieval fortified residence. The castle itself is long gone, its stones carted off at some point before 1841 to build the farm houses that stand nearby.

The site is known as Mac Crehin's Castle, and its history is bound up with the MacCrohan branch of the O'Sullivan Mores, one of the dominant Gaelic dynasties of the Iveragh Peninsula. An older name for the place, 'Letirmiccrohan', survives in manuscript. In 1656, a man named Cnogher MacCroghon was recorded as its occupant, but the disruptions of the Cromwellian settlement caught up with the property soon after. It was confiscated and granted in 1667 to an Alexander Eagers, and the MacCrohan connection ended there. By the time Ordnance Survey workers noted the site in 1841, no trace of the castle remained above ground.

What the earthwork does preserve is a readable outline. The platform measures roughly 30 metres north to south and 32 metres east to west internally, and the bank survives best on the northern side, where it still stands about half a metre high. The fosse here is U-shaped in profile, averaging seven metres wide and over a metre deep. A causeway across the eastern fosse, about five and a half metres wide, may mark the original entrance, and there are traces suggesting a channel was once cut to direct water from the nearby stream into the fosse. Inside, an uneven interior rises slightly above the surrounding ground, and a large sod-covered mound in the south-east quadrant, raised about 1.4 metres above the interior level, is thought to mark the actual footprint of the vanished castle.