The island of Cajual is located in the Baía de São Marcos near to Alcântara, Maranhão, Brazil.^[1]

Cajual Island

Satellite image by CBERS-4.
Geography
Location	Baía de São Marcos
Administration
Brazil
Municipality	Alcântara
State	Maranhão

The island is an important Brazilian paleontological site, where fossils of animals such as Spinosaurus and Sigilmassasaurus were found, and also such plants as conifers and ferns. The finds include the remains of the largest carnivorous dinosaur in Brazil. Traces of the maxillary and nostril of the specimen were found. Known as Oxalaia quilombensis, the species is part of the family of dinosaurs known as Spinosauridae, with elongated skulls and spines along the back.

The presence of fossils also present in Africa proves that the continents were once united, forming Gondwana. The "Lage of the Joker", where the fossils are found, is up to 2 meters below the water at high tide, so it can only be visited for only a few hours a day.

Currently, the island of Cajual is home to a small community of quilombolas.