Among the natural gems mentioned is the Sierra de Castril Natural Park, north of Granada, covering nearly 13,000 hectares of karst landscape. This environment, shaped by water, features canyons, caves, sinkholes, and waterfalls. The highlight is the Cerrada del Río Castril, a walkway that follows the river through a narrow gorge, with wooden paths clinging to the rock, a suspension bridge, and a tunnel with a small internal waterfall.

Another featured destination is the Pozo de los Humos in Salamanca, within the Arribes del Duero Natural Park, known for its impressive mist cloud that mimics Niagara Falls. This phenomenon occurs where the river hits a tectonic fault, forcing water over a massive granite wall. Visitors can admire the falls from a footbridge on the Masueco side or from a viewpoint in Pereña, with its most abundant flow between December and May.

In Murcia, the Almadenes Canyon, described by the Arab geographer Al-Zhury in the 12th century, is an 11-kilometer gorge with cliffs up to 150 meters high, carved by the Segura River. It hosts the region's largest otter population and UNESCO-listed rock art sites, accessible via guided kayak tours.

Other wonders include the Cega River Gorge in Segovia, the surreal Sa Pedrera de Cala d’Hort (known as Atlantis) in Ibiza, the Laguna Grande de Peñalara in Madrid, and Lake Valdemurio in Asturias, each offering a unique experience for nature lovers.