The slave ship Mariana arrived with enslaved Africans in Brazil. About 520 people had been taken aboard and approximately 380 arrived.

Vessel: Mariana; flag: Portugal / Brazil; rig: Galera. People recorded in connection with the voyage: Captain: Domingos, Jerônimo; Investor: Barros, João de Santiago. The voyage began at Rio de Janeiro on 21 June 1821. Principal recorded place where captives were acquired: Mozambique (East Africa and Indian Ocean islands). Principal recorded disembarkation place: Rio de Janeiro. Recorded duration of the captives' Atlantic crossing: 51 days. Estimated mortality during the crossing: 27.0%. Recorded outcome: Voyage completed as intended.