This chapel, devoted to Santa Eufemia, in the hamlet of Ribas, in the parish of Oza, is one of the most visited hermitages in the Municipality. 

There is delightful, old, Galician legend that recounts the story of a multiple birth in Baiona. Nine young girls destined to death by drowning, but who were saved, becoming the first great saints and martyrs of the Church. Santa Eufemia was one of those martyrs who has enjoyed a great deal of tradition and devotion in both Galicia and Portugal. 

The historical documentation of the Cathedral Archive reveals the existence of this hermitage since 1547, consecrated since at least 1775 to Santa Eufemia, back then the most important confraternity in the area. September 16 is the day on which this saint is commemorated, owing to which, every year on the weekend of this day, the pilgrimage of Santa Eufemia is celebrated, and hundreds of people come from all over the region to celebrate a mass as an offering.

Alongside the chapel is a Baroque stone cross, moved from its original location in the 1980s, as this is the place chosen for the fairground, and in which an inscription with the name of the donor can be read: GOMEZ A(NO) 1768. 

Father Pedro Nolasco Gaite Sancho was a Mercedarian linked to the Monastery of Poio, who travelled through a large part of our territory during the first decades of the last century, captivating thousands of parishioners in rural Galician parishes with his sermons. The newspapers of the period described his oral skills and eloquence, but few include details of his facet as a draughtsman and cataloguer of many of the monuments he visited. Today, around 200 drawing of the most traditional temples of Galicia are preserved, some of which have disappeared or have been altered. These drawings of the Sanctuary of Santa Eufemia bear witness to the passage of this religious traveller through this parish of Oza.