Redgrave & Lopham Fen is the largest remaining river valley fen in England and the source of the River Waveney. As one of the most important wetlands in Europe, Redgrave and Lopham Fen now has international protection. As well as open fen the reserve includes a mixture of wet heathland, open water, scrub and woodland. The underlying acid and alkaline geology has resulted in characteristic wildlife including many species now rare in Britain.