The mill was one of the central places in the life of a rural community, where the memories of once, are still very much alive in the daily rituals of the millers and in the endless spinning of their millstones and casters. Although there are mills throughout the municipality, it is along the Rio Caima that we have the units of greatest expression and importance, since the more stable flow allowed permanent work. However, also in the rivers Fílveda and Jardim, in the streams of Albergaria-a-Velha, Fontão, Frias, Fial and Mouquim and in the countless corgas and ditches of all the parishes, there are traces or records of more than three and a half hundred mills, indicating the importance that the mill activity had in the region.