O Grove is a small peninsula at the southern end of the Arousa estuary. It is joined to the mainland by the A Lanzada beach, although this was not always so: O Grove was an island until silting from the Umia river met the dunes of A Lanzada to create the O Vao isthmus.

The Con da Siradella is the highest point on O Grove, at 165 metres. The well-kept wooden observation platform provides all-round vistas, with excellent views of the isthmus and A Lanzada beach.

The observation platform is located on a pine-covered hill topped by granite boulders and curious rock formations, reminding visitors that con means “stone”.