This fountain was built in the 17th century, but it is known the existence of a spring in this place at the beginning of the 16th century. It is situated beneath Quinta do Martinho by Ribeira de S. João (river).$nbsp;

This is a very simple fountain. A quadrangular basin encrusted in two pillars with moldings and capitals. The top frontal and pyramids are entirelly made of granite.

Between the pillars is a tympanum with cutout moldings. This ensemble is topped by an armillary sphere and the coat of arms of Portugal, in Manuelino architecture style. Nearby, two water basins, one served as trough for animals and the other was used to wash clothes.