Reaching it always required a water crossing.

This means that the modern humans whose teeth were found at Leang Bulu Bettue were the descendants of people who had successfully made ocean crossings — they were maritime people, or at least descended from maritime people, even if they themselves were living as forest and karst foragers.

The Areca Palm In Southeast Asia: An Ancient Relationship

The areca palm that produces the betel nut did not appear in Sulawesi by accident.

The plant has a long evolutionary history in the tropical forests of Southeast Asia, and it has been part of the human landscape in this region for a very long time.