O Rosal is a small, fertile valley in the far southwestern corner of Galicia, where the Miño river meets the Atlantic and the border with Portugal. It is wine country — a sub-zone of the Rías Baixas appellation, known for crisp Albariños and the local Rosal blends that mix Albariño with Loureiro and Caiño. The vines cover south-facing slopes running down to the river, and the mild, wet climate means harvests come in year after year with little drama.
The landscape is gentler than the rocky coast further north: low hills, orchards, grape trellises, and a few quiet villages clustered around old churches. Paleolithic tools and Roman-era hill forts (castros) have been found around Marzán and O Picón, and the village of San Vicente de Marzán has a hermitage documented back to the 14th century. The Carmelite convent and the House of Devea are worth a look if you're passing through.
Most people come to taste wine, drive the river road, and cross to Tui and the Portuguese fort at Valença do Minho on the other bank. It is an easy day out from Vigo and a good detour on the way to or from Portugal.