The slave ship Boa União departed on a transatlantic slave-trading voyage that would carry enslaved Africans to Brazil.

Vessel: Boa União; flag: Portugal / Brazil; rig: Brig. People recorded in connection with the voyage: Captain: Melo, Francisco José de; Investor: Viana, Joao Martins Lourenço. The voyage began at Rio de Janeiro on 15 July 1812. Principal recorded place where captives were acquired: Cabinda (West Central Africa and St Helena). Principal recorded disembarkation place: Rio de Janeiro. Estimated mortality during the crossing: 3.0%. Recorded outcome: Voyage completed as intended.