Entre Mer et Étangs: Forest of Castillon and the Pourra and Engrenier Ponds Loop

The full loop, as described, is approximately 21.7 km and takes around 5 hours and 45 minutes to complete. However, there are shorter variations mentioned in the area, such as a 4.1 km version that takes about 2 hours, or a 6.6 km loop with more elevation.

Komoot rates this specific route as 'difficult' due to its length and total elevation gain of over 200 meters. While some shorter sections in the area are described as 'very easy' or 'easy to moderate', hikers attempting the full 'Entre Mer et Étangs' loop should be prepared for a challenging and extended trek.

The trail offers diverse terrain, including paths through young Aleppo pines, sections along an old canal, forest paths, and even some wooden stairs. You'll encounter varied surfaces as you traverse the landscape between the sea and the ponds.

You'll enjoy magnificent panoramic views of the Chaîne de la Nerthe mountain range, Sainte-Victoire mountain, and surrounding towns. Key natural features include the View of the Étang du Pourra and Views of Étang d'Engrenier. The Étangs de l'Engrenier and Lavalduc are particularly unique for their occasional pink coloration due to microscopic algae, attracting pink flamingos.

Yes, the route features historical elements such as an old canal system. You can also make a short detour to see vestiges of troglodyte dwellings. The ancient Oppidum of Saint-Blaise, inhabited since the 7th century BC, is also within reach.

Specific parking details for the exact trailhead are not provided, but the trail is located near Port-de-Bouc and Saint-Mitre-les-Remparts. Hikers typically find parking in or near these towns to begin their journey. It's advisable to check local tourism websites like martigues-tourisme.com or marseille-tourisme.com for up-to-date parking information.

While the trail is generally accessible, specific regulations regarding dogs in the Réserve Naturelle du Pourra - Domaine du Ranquet are not detailed. It's always best to keep dogs on a leash to protect local wildlife, especially around the bird-rich Étang du Pourra, and to check with local authorities for any specific restrictions.

The trail is open all year round, making it a flexible option. However, to avoid the intense summer heat of Provence, spring and autumn are generally the most pleasant seasons for hiking. These seasons offer milder temperatures and beautiful scenery.

There is no information indicating that permits or entrance fees are required to access the Réserve Naturelle du Pourra - Domaine du Ranquet for hiking. However, visitors should always respect the natural environment and adhere to any posted regulations within the reserve.

Yes, this route incorporates sections of several other official trails. You will find yourself on parts of the Sentier de grande randonnée 2013, the 'Entre mer et étangs' trail itself, the Forêt de Castillon Étang de Saint-Blaise, and the Forêt de Castillon Etangs de Pourra et d’Engrenier, among others.

The Étang du Pourra is known for its rich birdlife, being fed by freshwater, making it an excellent spot for birdwatching. There's even a dedicated bird observation table nearby. The Étangs de l'Engrenier and Lavalduc attract pink flamingos, especially when the water takes on its unique pink hue from microscopic algae.