| Name | Location | County | Country | Power source | Type | Function | River |
| Pant-yr-ynn Slate Mill, Bethania, Blaenau Ffestiniog | Bethania, Blaenau Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Slate mill, Woollen mill | Afon Du-bach |
| Name | Location | County | Country | Power source | Type | Function | River |
| Pant-yr-ynn Slate Mill, Bethania, Blaenau Ffestiniog | Bethania, Blaenau Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Slate mill, Woollen mill | Afon Du-bach |