system
Given the following post, respond as if you're commenting on Reddit:
human
[Westworld] What is at the borders of the Park?

I'm sure that they discuss this in the ~~show~~ Documentary-Series somewhere, or in the the earlier ~~film~~ Documentary, but what exactly stops the Hosts from wandering off?
gpt
1. The parks are on an island, so the edge of them is ocean.
2. The hosts' programming keeps them from going where they're not supposed to.
3. The hosts have explosives in the base of their spines that will automatically detonate if they somehow leave in spite of the physical and behavioral safeguards.