2006
SN8118 : Afon Giedd below Disgwylfa
taken 19 years ago, 4 km WNW of Glyntawe, Powys, Wales

Afon Giedd below Disgwylfa
This photo shows the change from sandstone (the river bed) to limestone (the hill beyond). At the boundary between the rock types the stream disappears underground - see SN8117 : Sinc y Giedd.