Build a movie plot around this: Where are they walking through? They are walking through the desert.
Answer:
The characters drive to a remote location to hike at a site marked "Wilderness Trail". As they start, they see some other hikers passing by. After some walking, talking, and an impromptu foot race, they decide to head back. Before long, they realize that they are lost. That night, they build a campfire.Over the next couple of days, the two hikers wander through the wilderness without food or water. They try splitting up for a while, they try to retrace their steps, they try to follow some animal tracks, all to no avail. They grow increasingly irritated with each other as the situation becomes dire.They eventually find themselves slowly walking, mostly in silence, through a desert. They finally collapse due to fatigue and dehydration. The weaker of the two (Affleck) proclaims that he is "leaving", and reaches towards Damon's character. Damon's character rolls on top of Affleck and wordlessly strangles him before collapsing again.After some time, Damon's character awakens and realises that a highway is not far away. In the final sequence, he is badly sunburned but watches the passing landscape from the car of the father and son who have seemingly rescued him.