As the name implies, Ferreiros was once home to a notable blacksmithing trade. More recently it was another center for small dairy production, and that industry has given way to supporting pilgrims.
Beyond Ferreiros you will encounter the 100km marker. It is the single most vandalized object on the camino, changing from day to day as pilgrims leave their mark. From here on to Santiago the terrain has smoothed out, but do not be deceived. Although the height of the peaks has been reduced, the frequency with which you have to climb the smaller ones has increased.