Nearest town: Chepstow
Nearest village: Llangwm
Map reference: ST 445968
The capstone of this burial chamber,
now broken, measures about 3.6m (12ft)
This dolmen, called also Garnllwyd (Grey Fortress), is quite easy to find in a field at Llangwm, near the crossroads on the B4235 Chepstow to Usk road. It looks like a portal dolmen, but it was probably a chambered tomb (traces of a double chamber and of a passage entrance are still visible). The huge broken capstone is 3.6m (12ft) long.
Note that the Ordnance Survey maps place the chamber on the wrong side of the road.