It is well known that the surface area of the world’s oceans covers 361 million square kilometers. The volume of water in the oceans is ten times greater than the volume of land that rises above the surface. But is all the water on Earth accounted for?
In Australia, a well was drilled to a depth of 3,000 meters, revealing a vast underground water reservoir stretching beneath much of this sun-baked, wind-swept continent.
Some scientists have proposed that similar underground seas may exist beneath other continents as well. This hypothesis has been supported by recent discoveries. Chinese geologists recently uncovered a massive underground sea beneath three provinces—Henan, Anhui, and Jiangxi. The area of this hidden reservoir is approximately 200,000 square kilometers, which is more than five times the size of the Sea of Azov.