Black or Caspian is a term used to refer to two different seas. The Black SEA is located in southeastern Europe and western Asia, while the Caspian SEA is located between Europe and Asia. The crossword solution for the term BLACK OR CASPIAN is SEA, which is an acronym for the three words: Salty, Eutrophic, Anoxic. This acronym is used to describe the characteristics of the two seas, as both are saline, eutrophic, and anoxic.