Around 500,000 to 1 million enslaved Africans were brought to Rio de Janeiro's Valongo Wharf between 1811 and 1831. This location in the port area between the Coelho e Castro and Sacadura Cabral streets was the site of their arrival and trading during the period of the Atlantic slave trade to Brazil. Though the African slave trade was officially blocked in 1831, clandestine activity continued until 1888. Of the estimated 4.9 million slaves brought to Brazil during the Atlantic slave trade, a substantial number had their first contact with the country at the Valongo Wharf.