Huddled between the urban brawn of Cardiff, Caerphilly and Newport is small woodland of spruce and birds and dank gullies. There is a stream in this woodland, the kind of you may not even notice, should your mind be elsewhere. Out of view beneath the path, it is the cool air welling up from its jostling waters that first alters you to it. You soon smell it, all earth and minerals, before finally reaching it with sight.

Recorded by Daniel Graham, presented by Hannah Tribe.

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