The area around
Aberystwyth and the Dyfi Valley is known as the
Dyfi Biosphere (). It was
UNESCO-designated in 1978. Within the biosphere are a number of
Special Areas of Conservation and
Sites of Special Scientific Interest (
Cors Fochno, Coed Cwm Einion and Pen Llŷn a’r Sarnau). In March 2021,
Natural Resources Wales (NRW) granted
Montgomeryshire Wildlife Trust a licence to release a family of beavers into an enclosure within the Dyfi Wildlife Centre (Cors Dyfi), the first officially licensed release of beavers in Wales. Beavers have not yet been released under licence into the wild into the Dyfi catchment, but a licence application is being developed by the Welsh Beaver Project (North Wales Wildlife Trust/Wildlife Trusts Wales) for submission to Natural Resources Wales. There is a small population of beavers already living wild within the Dyfi catchment whose origins are unclear. The estuary is known for its
saltmarshes. ==In popular culture==