When Scientists Realized What Made These Tunnels The Mystery Had Only Just Begun – Page 2 – News
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14. Rondonia


Deep within the Amazon, there is the Brazilian state called Rondonia. Rondonia is known for its vast rain forests, making it one of the densest areas in the region. Rondonia is where scientists discovered that the large caves were actually more like giant caverns that were almost tunnel-like. In fact, these caverns stretch nearly 2,000 feet into the ground.