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The figure caption states that the red part is the Hajnal line. The red part has two sides.

• prablenha 8y ago
  In their effort of calling it a line they made it complicated to see. They should've just highlighted the zone or something.
  • 80386 8y ago
    Here: https://i.imgur.com/IOenPsu.png https://i.imgur.com/IOenPsu.png
    • enriquto 8y ago
      But this image has less information. What about the boundary between south Italy and Greece, that are delimited by the blue line?
      • 80386 8y ago
        It doesn't exist. Southern Italy and Greece are both outside the Hajnal region.
        • enriquto 8y ago
          And then why is this boundary drawn on the wikipedia article?