Llyn Crafnant
The River Crafnant ( "Afon Crafnant" in Welsh ) joins the River Conwy at Trefriw , but not before some of it has been diverted to pass through the Trefriw Woollen Mills to generate hydro-electricity for the machinery . 
<triplet> River Crafnant <subj> River Conwy <obj> mouth of the watercourse <triplet> River Conwy <subj> River Crafnant <obj> tributary