Cajueiro da Praia is one of the four coastal cities of Piauí, Brazil. The municipality contains part of the 313800 ha Delta do Parnaíba Environmental Protection Area, created in 1996. The city is home to the Cashew of A Praia (Cajueiro da Praia), which is either the largest cashew tree in the world, at 8800 m2, or the second largest, after the Cashew of Pirangi. The tree has been studied by the State University of Piauí.