Starting from Doñana National Park Visitor Centre called La Rocina, on the road from El Rocío to Almonte, the Charco de la Boca trail (3.8km) crosses a pine forest and flood zones covered with lush vegetation. This is especially the case at the bridge over the Algaida del Carrizal, surrounded by reeds, ferns and large willows. Along the way there are several observatories where you can watch the birds.