Guaporé Biological Reserve is one of the largest and most remarkable protected areas in Brazil. It comprises representative samples of forests seasonally flooded by clearwater rivers and flooded grasslands, both wetland types which are very representative of the Brazilian Amazon. The Site is of great importance for the conservation of biological diversity in the area: it hosts a rich and diverse flora and fauna, including endangered species such as the black spider monkey (Ateles chamek) and the giant otter (Pteronura brasiliensis). Among the threats to the Site are invasive non-native species, fires and harvesting of aquatic resources.