The Sargasso Sea is unique in that it is the only sea in the world that has no land borders - it is defined entirely by ocean currents. Bermuda lies on its western edge. It was also featured in the pilot episode of Jonny Quest.
You know, I think the Netflix Carmen would have been better if they had done good flashbacks. Carmen was a teen right? Why not do flashbacks of when Carmen and Chase were partners and working together? Or when Chase was chasing Carmen? Or more about when Carmen quit?