The path runs along the edge of the glacial cirque of the Brava and Los Patos lagoons, maintaining the ascent to the west and connecting with the Sendero de las Lagunas PR-BU 203, marked with white and yellow wooden milestones. The top of the itinerary and of the Sierra de Neila is the vertex of Alto de la Campiña (2,050 m), also called Mojón del Muelle, the best place to appreciate the landscape of circuses, moraines, lagoons and glacial steps modeled by Quaternary ice a thousand years ago. The views are extraordinary, on clear days they reach the silhouette of the Central System. The path continues along the edge of the large glacial niche where the floating peat bogs of the Larga and Negra lagoons are located, the main representative of the environmental values of the natural park. In 1970, works were carried out that determined the appearance of the current landscape, raising huge siltation slopes in the glacial cirques and opening access roads to facilitate the entry of nature tourism at the time, which mainly sought bathing and fishing in the lagoons. Later, with the declaration of the natural park, some previous works were reformed, eliminating a lot of artificial material to recover the natural ecosystem of the mountain environment. The path surrounds the cirque, passes through the Pico de la Laguna (2,004 m) and descends the lateral moraine following the milestones of the Sendero de las Lagunas towards the Laguna de la Cascada along the Tejos path. There is another path that is also signposted and goes to the right, going directly down to the cirque of Laguna de la Cascada.