The Coronallacs is a 5-day hiking trail in the small mountain country of Andorra, known for its challenging terrain and scenic beauty. The route covers nearly 7,000 meters of elevation gain and includes visits to about twenty lakes, offering hikers a mix of natural landscapes and historical sites. The trail connects four guarded shelters, which serve as rest points for hikers. Each day presents different challenges and highlights, taking travelers through valleys, passes, and glacial features that showcase Andorra’s rugged environment. On the first day, hikers start in Escaldes-Engordany, a town known for its thermal springs, and travel 13 kilometers to the Shelter of l'Illa, gaining 1,450 meters in elevation. The route passes through the Madriu Valley, a UNESCO World Heritage Site that has been shaped by agriculture, livestock farming, and iron production over centuries. This area is also rich in cultural and natural history, making it a key stop on the trail. The second day leads hikers from the Shelter of l'Illa to the Shelter of Juclar, covering 19 kilometers with a 1,350-meter elevation gain. This part of the route includes a climb to the Pessons pass, one of the highest points on the trail, and a descent into the largest glacial cirque in Andorra. A glacial cirque is a bowl-shaped valley formed by glacial activity, often surrounded by steep slopes and containing a lake or glacier. The third day takes hikers from the Shelter of Juclar to the Shelter of Sorteny, covering 17 kilometers with a 1,400-meter elevation gain. Along the way, they pass through Incles, a valley historically linked to smugglers and refugees due to its remote location and difficult terrain. The route also includes the Cabana Sorda lake, adding to the natural beauty of the journey. The fourth day is the most challenging, traveling 22 kilometers with a 1,900-meter elevation gain from the Shelter of Sorteny to the Shelter of Comapedrosa. This day includes the Angonella lakes and offers views of Comapedrosa, the highest peak in Andorra. The final day of the trail returns hikers from the Shelter of Comapedrosa back to Escaldes-Engordany, covering 21 kilometers with a 700-meter elevation gain. The route includes a descent through the Sanfons pass and offers a chance to see a bearded vulture, a rare bird species that can be found in the mountainous regions of Europe. This final stretch provides a rewarding conclusion to the challenging and scenic Coronallacs hiking itinerary.