According to the National Forest Inventory (NFI) (on forestresearch.gov.uk), there is approximately 17,500 ha of woodland in Wales where ash is the dominant canopy component.
Yn ôl y Rhestr Goedwigoedd Genedlaethol (NFI (ar forestresearch.gov.uk), mae tua 17,500ha o goetir yng Nghymru lle mai coed ynn yw'r elfen gryfaf o'r canopi.