The project, funded by the Welsh Government focuses on the Wye catchment from its source on Plynlimon to the border at Hay-on-Wye.
Mae'r prosiect, a ariennir gan Lywodraeth Cymru, yn canolbwyntio ar dalgylch Gwy o'i tharddle ar Bumlumon i'r ffin yn Y Gelli Gandryll.