The camino between Padrón and O Cádavo is arguably the most difficult of the route, and possibly the reason for the nickname the leg wrecker. Allow for extra time, especially after a rain since many of the sections become thick with mud.
The sacred fountain (fons sacrata) that gives the town its name is located behind the Iglesia de Santa María de Fonsagrada (on the aptly named Rúa do Fonte), a chapel-sized church in the center of town. The fountain and its curative waters are part of numerous miraculous bits of lore.
The camino exits Fonsagrada along the main road, and shortly after follows a secondary road parallel to it, into Padrón. Beyond Padrón it follows through forested paths off of the road.