The Columbretes Islands Natural Park is located just off the coast of Castellón. The Columbretes Islands, known in antiquity as the Islas de las Serpientes (the Serpent Islands) rise defiantly out of the sea, a small archipelago of volcanic origin found halfway between the Peninsula and the Balearic Islands.
The Columbretes are an archipelago that is divided into four islands: La Grossa, la Ferrera, la Foradada, and el Carallot. Because it is at a distance from the mainland and experiences a harsh marine environment, the flora and fauna of the islands are rich in native species. The richness of its seabed is particularly attractive to diving enthusiasts. The Islands are Natural Park and Marine Reserve, thus guaranteeing them a significant level of protection which, until 3 decades ago, had historically been lacking. Nowadays, Illa Grossa is the only island that may be visited, and only with proper authorization.
Due to their volcanic origin, isolation (which allows various species of animals and plants to thrive), small size and harsh environmental conditions, the islands make up a unique and especially fragile ecosystem. The sea bed and waters are characterized by an extraordinary beauty and richness and high degree of conservation.