Santa Cruz do Arari is a Brazilian municipality located in the state of Pará. Its population as of 2020 is estimated to be 10,314 people. The area of the municipality is 1,074.854 km2. The city belongs to the mesoregion Marajó and the microregion of Arari.
Nearby Lake Arari is a large lake located on the island Marajó, which is a tourist attraction and the home of a wide variety of avian life.[4]
The municipality is contained in the 59,985 square kilometres (23,160 sq mi) Marajó Archipelago Environmental Protection Area, a sustainable-use conservation unit established in 1989 to protect the environment of the delta region.[5]