The Parazinho Biological Reserve is in the municipality of Macapá, Amapá.

[1] It covers an island on the north shore of the mouth of the Amazon River.

The terrain is flat with clay, silt and sand sediments deposited by the sea and the river.

Vegetation includes medium-sized trees, shrubs, some palms, mangroves and reeds.

It supports migratory bird species of the Charadrius, Calidris and Sterna families, and of the laughing gull (Leucophaeus atricilla) and lesser yellowlegs (Tringa flavipes) species.