This jungle was described as this nice, beautiful place, I would say, that had lots of fruits(William Golding 9), and animals and available drinking water to the point where if the boys needed any of these things all they had to do was look around and search they could find it with little to no work at all. This was a perfect sinless place where little to no man has been before loaded with opportunity. These places were both peaceful and sinless at the beginning and untouched by mankind, then when man was put onto these places man was missing something and by the end ultimately caused chaos and reasons to sin. In the Garden of Eden Adam was missing something and that something was another person, so God took a rib from Adam and made woman and called her Eve. As for the boys in Lord of the Flies they were missing structure and order in their new society.
There was a beast in both stories that caused the characters and people to sin