This small circular route is mostly integrated in the forest area of ​​Biscoito das Fontinhas, classified as a protected area for the management of habitats or species.

This circular route thrives in Monte Brasil, a geosite formed by an ancient extinct volcano with origin in the sea and that later joined the city of Angra do Heroísmo, classified as World Heritage by UNESCO.

In Monte Brasil, we can find the Fortress of São João Baptista, built in the late 16th century, one of largest fortresses built by the Spanish Empire across the world.

The small circular route of Serreta thrives in the Natural Park of Terceira, in the area of the Natural Reserve of Serra de Santa Bárbara and Mistérios Negros and in the Protected Area for the Habitats management or Species of the Central Plateau and Northwest Coast.

This small linear route runs along the northern coast of the island, between the parishes of Agualva and Quatro Ribeiras, mostly integrated in a protected area of the Terceira Nature Park, classified as a protected area for the management of habitats or species.    

The trail of Mistérios Negros thrives in the Natural Reserve of Serra de Santa Bárbara and Mistérios Negros of Natural Park of Terceira, also included in the Special Area of Preservation of Serra de Santa Bábara and Pico Alto of Natura 2000 and in the geosite Caldeira de Santa Bárbara and Mistérios Negros.