When you picture a great watershed between two rivers, a mountain ridge probably comes to mind – not a reedbound marsh barely 20 yards above sea level. But Redgrave and Lopham Fen is a miraculous, albeit low-key place.
This hidden fen is the source of both the River Waveney, which flows 59 miles east to join the sea at Great Yarmouth, and the Little Ouse, which flows 37