Ten square kilometers (six square miles). That's approximately the total amount of beach that provides relative safety for the survivors although even that comes with nature's brutal reminders.
At the top of the beach is a massive wetland. A wildlife paradise, but home to initially, five aggressive nomadic mountain lions. Down the beach from their camp, where they discovered the second aircraft wreck, a clan of hyenas has taken residence. And now that the orcas have left the bay on their annual migration route, the great white sharks are once again at the top of the aquatic food chain.
The five nomadic male lions explore their territory regularly and contact with the survivors is a frightening experience. Made even more so when the lions find mates and soon five becomes eleven lions living in the wetland.
In a long food chain, the lions are the absolute apex predators. Nature can be beautiful or brutal, depending on one's position in the food chain, and out here, the survivors are somewhere near the bottom and the message is driven home repeatedly. Carelessness costs lives theirs.