Amazon

From Teletraan I: The Transformers Wiki

The Amazon is a massive rainforest on the planet Earth. It has served as the site of several battles during the Transformers' stay on that planet.

[edit] Unicron Trilogy Continuity

In the Transformers video game, several early skirmishes occur in the Amazon. The Autobot strike force find their first Mini-Cons here, and encounter Cyclonus twice, culminating in a battle atop an ancient human temple.