Surrounded by fresh and salt water - from the Rivers Amazon and Tocantins and the Atlantic Oce is the island of Marajó, separated from Belém by the River Tocantins, and which is the largest river island in the world.

It is the phenomenon result formed by gigantic waves where the waters of the River Amazon met the sea the island is also renowned for its pottery and famous for its herds of buffaloes, which are the largest in the country.

Many of the river beaches on the island of Marajó are characteristically long, Araruna extends for two kilometres, Pesqueiro thirteen and Caju Una, fifteen. One of the most popular for leisure purposes is the beach at Joanes, six hours by boat from Soure, one of the twelve communities on the island that also includes large estates for the rearing of buffalo, some of which offer tourist accommodation.