Looking from the West, towards Fan Llia. Down in the valley bottom is Rhyd Wen Fach ring cairn. The outer banking, nearest to the camera here, has been cut into in the past by a drainage ditch.
Image credit: Cerrig
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Nicely captured Cerrig, didn't know this was a henge! (I take it this is the "enclosure" on the OS?)
You may be right about that, I have also seen it marked as a cairn, but that was on an older map. It's just West of south from Maen Llia, 230 metres away, on the opposite side of the road. If you go looking for it you'll find it's quite difficult to see until you are almost stood inside it.