The Zadorra river as it passes through La Puebla de Arganzón Nature · La Puebla de Arganzón, Ebro, Burgos The Zadorra crosses the municipal district drawing a fertile meadow between the hills of the enclave; the river marks the natural limit of the walled town and has conditioned the layout of the town since the Middle Ages. Photo: Zarateman (CC0) What to see and do in La Puebla de Arganzón