 The Dyfi Furnace is in the village of Furnace, Ceredigion, Wales, adjoining the A487 trunk road from Machynlleth to Aberystwyth, near Eglwysfach.The site for Dyfi Furnace was chosen downstream of the waterfall on the River Einion to take advantage of the water power from the river and charcoal produced from the local woodlands, with the iron ore being shipped in from Cumbria via the Afon Dyfi.The furnace built around 1755 was only used for about fifty years to smelt iron ore. By 1810 it had been abandoned and the waterwheel removed.