In the Swiss Family Robinson, the family in the story line decided to build the fort in the edge of the savannah in order to protect themselves from harm and to be able to look out for each other as they knew that the pirates or people in living nearby could attack them any time soon. This is the reason why they decided to build the fort on the edge.
Explanation:
Lah Mana Saia Tau Saya Kan Indonesia
The time has come for me to make my journey into the desert. I am only eighteen. But, all children my age am required to make the journey to be accepted as adult members of the community. The village chief told me that it was very important to take plenty of water and materials to build a tent.
The mission seems long and hard. I taste the fresh water from my canteen and the sun feel too hot to bear. I travel many days and many nights.
After seven days, I return home with relief. As I arrive back at my village, the villagers appear so proud of me.
Hope this helps you:))