Fazenda Rainha do Curuá Airport is a small, private airstrip located in the municipality of Altamira, in the state of Pará, Brazil. It carries the ICAO designator SIG4 and has no assigned IATA code, reflecting its status as a non-commercial facility. The airstrip primarily serves agricultural operations and private aviation associated with the Fazenda Rainha do Curuá estate. Altamira is a large municipality in the Amazon region, and such private airstrips are common given the vast distances and limited road infrastructure in the area. No scheduled commercial passenger services operate from this facility, and it is not open to the general public.