It starts at the far end of Boimorto village, and the locals have kindly made home made signs. The albergue in Boimorto also gives out photocopied home made maps (photo 1). It's very easy, flat, all on tarmac, and very quiet, although the occasional car can come quite fast, so keep alert. You need to take food and water for the whole day, there is one bar but opening is uncertain, and the water point by the chapel is unreliable.
It's 25 km from Boimorto to Pedrouzo.
Route directions are very simple: leaving Boimorto, bear right just after the health centre by the basketball court (instead of left for the normal route via Arzúa), taking road CP0603. You'll soon see the Football Stadium on your right, keep going straight, a few km later a pretty chapel (Capilla Da Mota) on your left. Keep going straight straight straight. Locals have installed a sign to prevent you going wrong at one place (photo 2).
There is only one point in the whole day when you have to turn, so don't miss it: once you have passed the chapel, start to look out for a very distinctive white cylindrical concrete pigeon tower with a pointy roof in a garden on your right (photo 3). When you see it, turn next left onto DP0604 (painted red arrow, photo 4).
[NB the homemade map makes it look like the turning is just after the chapel, it is actually quite a long way after. The pigeon tower is a better landmark than the stop sign shown on the map, as there is more than one stop sign]
200m later turn right (official signpost 'Parroquia de Oins' with a shell sticker on it, photo 5). After the turning, keep straight again for several km, eventually through the scattered houses of Oines. Around here are the only yellow arrows you'll see, but you don't really need them. Cross the workings of a new highway by the new bridge. Keep going straight.
Finally you will come to a T Junction with a slightly busy road with a few houses (O Xen). Cross this road, and go a few metres up the road opposite, signposted Loureiros [not turning right immediately as the map implies]. You'll see a path running alongside a hedge, this is the Camino Frances. Turn right for St Irene.