[1] Formerly called Paraná-Guaçu by the Tupinambás people who inhabited the region, Guajará Bay was the gateway for the Portuguese who wanted to occupy the Captaincy of Grão-Pará.

On board were 150 men, including Francisco Caldeira Castelo Branco, Discoverer and First Conqueror of the Amazon (his title at the time), who called the place Feliz Lusitânia.

On the site, the engineer-major Francisco Frias Mesquita began the construction, on the east bank of the bay, of the Forte do Presépio, the starting point for the foundation of the city of Santa Maria de Belém do Grão-Pará.

Even today, fish from the Guajará Bay are very present in the Pará's traditional cuisine in a variety of dishes, such as Pirarucu, considered by many to be the cod of the Amazon.

A river procession takes place on the waters of Guajará Bay every year as part of the Círio de Nazaré celebrations.

Created in 1985, the pilgrimage gives riverside dwellers, fishermen and sailors on the bay an opportunity to pay homage to Our Lady of Nazareth, the patron saint of Pará.

The so-called Casas do Ver-o-Peso were created in Brazil in 1614, in Rio de Janeiro, to accurately measure the weight of any goods and collect the tax.

Actions such as cleaning up the water, reforesting degraded areas and creating conservation units are some of the initiatives underway to preserve this important ecosystem.