Sítio do Físico, Portuguese colonial industrial complex in São Luís, Brazil.

Sítio do Físico is a colonial manufacturing complex in São Luís that spreads along the Bacanga River. The remains show stone walls, water tanks, wells, storage buildings, boat docks, and a system of channels that carried water to different work areas.

Built between the late 18th and early 19th centuries near the Igarapé do Coelho, a tributary of the Bacanga River, the site belonged to António José da Silva Pereira, físico-mor (chief medical officer) of the Captaincy of Maranhão. It housed the region's first industry, processing leather and rice and making wax and lime. After his death in 1817, it produced fireworks.

The place takes its name from a physician and reveals how colonial settlers organized production to support their growing community. Visitors can observe how different trades worked side by side, sharing the same water infrastructure for their daily operations.

The ruins lie on the right bank of the Bacanga River, near the Igarapé do Coelho, about 10 km from central São Luís and reachable by taxi or car. The archaeological site is open to the public daily from 9 am to 5 pm. Wear sturdy shoes for uneven ground, and bring sunscreen, a hat and water, as the site gets hot.

The site's name comes from the físico-mor, the chief medical officer of the Captaincy of Maranhão, Antônio José da Silva Pereira, who owned it. After his death in 1817 the works switched to making fireworks. Excavations also turned up several patterns of Pombaline-period azulejo tiles.