Santa Maria de la Tossa, Romanesque church at La Tossa mountain, Santa Margarida de Montbui, Spain.

Santa Maria de la Tossa is a pre-Romanesque church with three naves of six bays, covered by slightly horseshoe-shaped barrel vaults and separated by arcades on short, massive columns with plain capitals. Influenced by Bishop Oliba, it was extended around 1032 with a presbytery and three apses decorated with Lombard bands and blind arcades. The south portal and the double-arched bell gable date from the 16th century.

The church was built in the 11th century as part of the Montbui Castle complex in this mountain region. It emerged when Christians gradually took control of the territory.

The church kept its role as the parish of Santa Margarida de Montbui until 1614, when the parish was moved to the new church and this building became a dependent chapel; in 1828 it lost that status and remained a hermitage. The Vilaseca family added the northern chapel dedicated to the Virgin of the Rosary at the end of the 16th century as their burial place. The altar is presided over by a Romanesque image of the Virgin of Grace from the 13th century.

The site is best reached on foot by following marked hiking trails from Santa Margarida de Montbui and can be visited during daylight hours any time of year. The paths are not always easy, so wear sturdy shoes and allow time for a hike.

From the mountaintop, the church is visible from many places across the Anoia region, making it a landmark you can spot from a distance. This visibility shows how these buildings served as gathering points in the medieval landscape.