The slave ship Adamastor left the African coast carrying enslaved Africans toward Brazil. About 439 people had been taken aboard.

Vessel: Adamastor; flag: Portugal / Brazil; rig: Galera. People recorded in connection with the voyage: Captain: Bastos, Joaquim José da Rocha; Investor: Bastos, Joaquim José da Rocha. The voyage began at Bahia, place unspecified on 22 September 1820. Principal recorded place where captives were acquired: Mozambique (East Africa and Indian Ocean islands). Principal recorded disembarkation place: Bahia, place unspecified. Estimated mortality during the crossing: 14.0%. Recorded outcome: Voyage completed as intended.