Source of the Sió River Nature · Estaràs, Segarra, Lleida Image of Estaràs, not of the place itself. The Sió river rises at the spring of Gàver, within the municipality of Estaràs, at 589 metres of altitude, in a comarca of dry Catalonia where the initial flow is very scarce. It runs 77 kilometres until joining the Segre, its collector river, upstream of Balaguer, gaining flow as it crosses the irrigated area of la Noguera. The park located in the settlement of Gàver marks this point of origin. Photo: Jordiferrer (CC BY-SA 4.0) What to see and do in Estaràs