Fazenda São Joaquim Airstrip (ICAO: SD1J) is a small private airstrip located in the municipality of Amajari, in the state of Roraima, northern Brazil. It serves the operational needs of a fazenda (ranch or farm estate), providing access to an otherwise remote rural area near the northern frontier of Brazil. The airstrip is not open to the general public and does not handle scheduled commercial air services. Like many private fazenda airstrips in Brazil's interior, it plays a logistical role in supporting agricultural and estate management activities in a region where road infrastructure can be limited.