A massive underground river has been discovered beneath the Amazon Rainforest that is actually larger than the famous waterway that meanders through the jungle above. Researchers say that the new river –dubbed Rio Hamza after the leader of the team that found it– is located 2.5 miles beneath the surface and is many times wider than the Amazon River itself.

Both the Amazon and Hamza can trace their origins back to the Andes Mountains, flowing west-to-east from there. Each is also more than 3700 miles length and both eventually empty into the Atlantic Ocean along the coast of Brazil. But while the Amazon can reach an impressive 60 miles across at its widest point, the Hamza ranges from 125 to nearly 250 miles in width, making it far more massive than its cousin on the surface. The Amazon bests it in speed however, moving at a rate of up to five meters per second, while the Hamza creeps along at less than one millimeter per hour.

The discovery was made by a group of Brazilian scientists who studied 241 deep wells that were drilled, and later abandoned, by an oil company. The team recorded changes in temperature at various depths of those wells to help locate and measure the massive river. Their findings were first revealed at a meeting of the Brazilian Geophysical Society last week.

The team now hopes to continue their studies of the Hamza and hope to have a better understanding of its size and scope in the next few years.

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