The geological oddity that is Sarn Wallog

Cardigan Bay, Ceredigion Made up of rounded cobbles graded in size, this ‘causeway’ looks beguilingly like the work of our ancestorsThe amount of ice on the narrow footpath came as a surprise. Hidden from the sun on the south side of the valley, it had probably accumulated over a number of days – along with the layered, crusted frost on the nearby vegetation. Few people seemed to have walked this stretch of the Wales coast path recently; a fox crossing the track ahead and a bri