Amazon is a location in South America.
The setting is set to a military base that examines alien technology. It really looks like an advanced military base with high tech equipment. There also is a reservoir there and vents are also installed.
The Amazon Base
This is the only level where you can find the Rust Bucket 3 in gameplay instead of a movie.
Sumo Slammer Card Locations
After one of the glides in the beginning, you will notice a ledge beyond the ledge you land on. Drop down to receive the first card
When you get to the first save point you will also see a drawbridge. Charge it up and then run to the middle. Ride the bridge to the top and jump onto the platform above you to get the second card
After defusing the bomb, as you run to the exit to escape the self-destruct, to the left of the exit bridge is the third card. You need to glide down as Big Chill to obtain it