Along the sun-washed banks of the Douro River, the spa at Octant Douro offers a quietly luxurious retreat where nature sets the rhythm. Tucked within the hillside terraces of Castelo de Paiva, the setting feels suspended between water and sky, with views that seem to follow guests from treatment rooms to garden paths and outdoor decks. The atmosphere is minimalistic yet warm, allowing the serenity of the valley to take centre stage.