Just a short one: if you’re descending from Col de Planlara towards St-Nazaire-le-Désert, where the road doubles back on itself (signposted to St Nazaire), if you have just a few minutes to spare, head straight on to the D271, signposted to Montnègre. Instead of carrying on descending, you’ll have a short gentle ascent, giving you some nice extra views, and a better final descent into St Nazaire. Well worth it.
In the scenic photo from this diversion, you can see the descent from Col de Planlara, and where it carries on to St Nazaire.
Incidentally, please excuse the state of my map: it’s served me well for four years, having been used in the planning and execution of literally thousands of miles of rides here. I think I might treat myself to a new one.