Yr Afon A’r Graig Ceubyllau Afonyd Cymru

Where rivers flow over rock, the combined action of water and sediment can create intricate and beautiful natural sculptures. Some of the most striking forms are potholes: roughly circular depressions carved into the rocky beds of turbulent, upland rivers.

• ISBN: 9781845278564
• Author: Dewi Roberts, Hywel Griffiths, Stephen Tooth
• Publisher: Gwasg Carreg Gwalch
• Page count: 132
• Publication date: 2022-07-29