Scorched Earth
Destroy four fuel tanks as you proceed through the region. The tanks are spread out over multiple yards in the earlier portion of the area. All of them can be blown up by taking out explosions that are placed near the tanks.
SW of Weather Station: At the end of the first large area in the south, look for a truck with two red barrels stashed nearby. Shoot the barrels to destroy the fuel container on the truck.
SE of Weather Station: Shoot the barrels by another large truck. This one is in the center of the path, and it’s hard to miss.
NE of Weather Station: One truck is parked on the eastern side of the map. It isn’t too far from the helipad.
This tank is hard to find. It is in the final sequence before you get to the prison. After climbing out of the holding tank and getting back on solid ground, keep an eye out for the prison building. The final tank is in the back yard, but you have to get it before you zip line in. Shoot a Grenade Arrow at it to make it go up in flames!