In this task, you're given five sentences, numbered 1 through 5. Your job is to generate a title for the story that makes complete sense. The title must be short, with less than three words, use simple language, and include the main topic of the story.

Sentence 1: Will wanted to go for a hike. Sentence 2: He went into the desert for a bit. Sentence 3: Soon, he came across the border to Mexico. Sentence 4: Will decided he shouldn't cross that border. Sentence 5: He had no choice but to turn back.
The Border