The Tropical Atlantic is bounded on the north and south by temperate ocean realms. The Temperate Northern Atlantic realm lies to the north on both the North American and African-European shores of the Atlantic. To the south, the ocean realms conform to the continental margins, not the ocean basins; the Temperate South America realm lies to the south along the South American coast, and the Temperate Southern Africa realm lies to the south along the African coast.[1]
^ abcdSpalding, Mark D., Helen E. Fox, Gerald R. Allen, Nick Davidson et al. "Marine Ecoregions of the World: A Bioregionalization of Coastal and Shelf Areas". Bioscience Vol. 57 No. 7, July/August 2007, pp. 573–583. [1]