You head up the side of the Bay of Morlaix. At each turn, a new rocky headland comes into view, or then another of the islands that form part of the ornithological reserve here. Further on, you'll spot the Château du Taureau and Louët Island.
Mainly along minor roads that stick very close to the coast. Leaving Primel-Trégastel, there's a stretch involving a gradient of over 10%. Some of the coastal sections are along a county road (the D76 between Le Dourduff and Plougasnou and on the edge of St-Jean-Du-Doigt)."