Château de Pierrefonds, Pierrefonds, Oise, France (Camelot).
Cardiff, Wales, UK (Studio sets).
Raglan Castle, Raglan, Wales, UK (Castle: Daelbeth fortress. Moat: Ferry nearing the Isle of the Blessed).
Puzzlewood, Forest of Dean, Coleford, Gloucestershire (Morgana's hut and scene where Merlin and Lancelot are riding back to Camelot)
Clearwell Caves in the Forest of Dean, Coleford, Gloucestershire (Tunnels of Andor - Inside and hut where Merlin and Lancelot spend the night).
Three Bears Caves, Forest Fawr (Heol-y-fforest), Tongwynlais, UK (Tunnels of Andor - Outside).
Canop Ponds, Forest of Dean, Gloucestershire, England, UK (Vilia coming out of the water to heal Merlin).
River Ely (Afon Elai), near The Chestnuts, Miskin (Meisgyn), Wales, UK (River bank where Arthur and the knights clean off the gaia berries from their faces).
Trefil Quarry, Tredegar, Blaenau Gwent, Brecon Beacons, Wales, UK (Merlin and Lancelot ride to meet back with Arthur and the knights).