Graceful quick-step of the grey wagtail

Trawsfynydd, Gwynedd, Wales They are constantly in motion, dancing out of the gorge in undulating flight

Pont y Llyn Du on the Afon Gain, in the lonely moors east of Trawsfynydd, above the old gold mines at Gwynfynydd, is one of those places at which you'd never arrive except by design. It's one of my favourite haunts in the Welsh hills.

The peaty hill stream rushes down through a miniature rocky gorge under the old humped bridge to debouch into a round pool of amber depth, encircled by green pastures. You can traverse through on rock ledges beneath the arch, plunge into the pool if you're hardy and of the "wild swimming" persuasion. What most appeals to me are the spirits of the place.