The west twll of Rhosydd slate quarry. The opening here is around 150ft... plenty of room for a ddraig goch!
Sarn Helen passes through this valley. The route is named after Saint Elen of Caernarfon, a Celtic saint, whose story is told in The Dream of Macsen Wledig, part of the Mabinogion. She is said to have ordered the construction of roads in Wales during the late 4th century.
If you look carefully you can see the small waste tip for the Sarn Helen mine on the golden flanks of the hill .