It's hard not to try to climb to places you aren't meant to.
Just hold W down as you try to climb and slide around a rock
face using A and D to a ledge otherwise unclimbable, or through
a gap in the resistance. Of course there are those invisible
barriers, thud, oops. Still I managed to find a couple of places
where I could climb somewhere off limits. When you do, you can
find yourself on an isolated piece of ground surrounded by blue.
If you fall off the edge, you can end up in the screenshot below.

Well, I seem to have hit the trespasser's jackpot.
I found a way past the last hut where you hand over the diamonds.
It is the largest explorable no trespassing zone I've found.
Here's a few shots.

I blew up the trucks, walked further up the
road.


Hey, the trucks are back!