Pollardstown Fen is the source (via the Milltown Feeder) of much of the Grand Canal’s water supply. Here is a BBC programme about the sounds of the Fen (h/t John McCormack) and other aspects of the magical area close to Robertstown, Lowtown and the Hill of Allen.
Lock your door, turn off your telephone and spend half an hour listening. Shoot anyone who interrupts.
Since the programme was made, the sound recordist Tom Lawrence has died. His website is still up here.