Caldera de Taburiente National Park (Parque Nacional de la Caldera de Taburiente)

A UNESCO Biosphere Reserve (declared 2002, along with the entire island) and one of Spain's oldest national parks, established in 1954. The Caldera de Taburiente is a massive erosion crater — not volcanic in origin — measuring 8 kilometres in diameter with walls rising to 2,426 metres at Roque de los Muchachos, the island's highest point. The park covers 46.9 km² of pine forests, waterfalls, and deep ravines carved by water over millions of years. This is the world's largest erosion crater, formed by water erosion rather than volcanic collapse. Key hiking trails: PR-LP 13 (La Cumbrecita to Lomo de las Chozas, 8 km round trip, moderate difficulty — the classic descent into the crater floor via the Barranco de las Angustias) and PR-LP 18 to the Cascada de Colores (Coloured Waterfall), a waterfall tinted yellow and green by mineral deposits and algae. Camping is allowed at the Lomo de las Chozas campsite (free permit required from the visitor centre at El Paso). The La Cumbrecita viewpoint offers the most accessible panoramic views into the caldera with designated walking paths along the crater rim. The park receives over 300,000 visitors annually. Flash flood danger exists in the Barranco de las Angustias — always check weather conditions before descending.