The Charco de la Boca trail, which is easy and 3.8 km long, begins in the front courtyard of the La Rocina visitor centre. It consists of several adjoining paths, allowing you to organise your route according to your interests. The route heads towards the bank of the stream through a pine forest covered with a carpet of grasses. The stone pine is a species whose presence in the area has been documented since the 18th century and today constitutes one of the most distinctive landscapes of Doñana.
The first observatory overlooks the last section of the stream, where the channel becomes wide and shallow. During the seasons when the area remains flooded, countless birds populate these waters. The trail then enters the Algaída del Carrizal, a tributary of the stream that is covered with abundant vegetation. The footbridge winds its way through willows and reeds, offering a privileged view of the flooded areas.
Once you have crossed the stream, the pine forest continues, covering the entire route until you reach the second observatory over the stream. After this, you will see the Algaida del Meloncillo, another stream that carries water to the river. On both banks, the ground is covered with dense ferns, marking the transition to the riverside vegetation that covers the riverbed. Several large cork oaks stand out, located very close to the water next to the willows. At this point, the trail forks, offering the option of continuing along the footbridge or entering the pine forest again.
This second footbridge leads to flat, open terrain covered with white pine, where the pines give way to a canopy of white rockrose accompanied by various aromatic plants such as rosemary, lavender and almoradux. Around the stream, the ground is more humid and rich, and the vegetation diversifies, with the appearance of wild olive, kermes oak, mastic and palm trees.
Following the other branch of the trail, you will re-enter the pine forest and end up once again at Algaída del Carrizal, where reeds dominate the landscape. Climbing species entwine themselves among the reeds, supporting their long, flexible stems as they seek out areas of light; sarsaparilla, honeysuckle, bindweed and blackberries create a dense and intricate tangle.
Leaving the footbridge, the trail runs alongside the stream, offering a panoramic view of the different plant formations that line its banks, from the distant pine forests to the blanket of reeds and cattails that occupy the centre of the stream, passing through cork oaks, ferns and willow groves, in a great diversity of strata, colours and shapes.