The Gaià (Catalan pronunciation: [gəˈja]) is a 59 km long river in Tarragona Province, Catalonia.
Its source is at Santa Coloma de Queralt, situated in the Catalan Central Depression, gathering the waters of the Serra de Brufaganya and Serra de Queralt mountain ranges. It flows through deep gorges across the Catalan Pre-Coastal Range and then close to Santes Creus and, at the end, into the Mediterranean at the Tamarit Castle, Tarragonès, near Altafulla forming a coastal lagoon separated from the sea by a sandbar. The river mouth is a protected area.[
