Afon a'r Graig, Yr - Ceubyllau Afonydd Cymru

Autor: Dewi Roberts, Stephen Tooth, Hywel Griffiths

Žánr: Cizojazyčná literatura > English literature

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.