Well, who would have thought?! Metal Gear Solid 3 wasn't completely making up the lush jungle in the Soviet Union.
The Tigrovaya Balka nature reserve in southern Tajikistan really looks quite a lot like the forests in the game. There's even the right mountains nearby.
It would take a C-130 half an hour to fly over Afghanistan after going over the border from Pakistan rather than 3 minutes, but other than that, it actually checks out.