A fascinating world of hidden resources and geological features are what is under the Sahara Desert.
The hidden resources and geological features that are under the Sahara Desert include fossil aquifers, traces of lost civilizations and even ancient megalakes.
The largest fossil water system that is under the Sahara Desert is the Nubian Sandstone Aquifer System that stores massive amounts of water that is trapped underground.
The Nubian Sandstone Aquifer is a vast underground reservoir of water that holds significant amounts of water that is trapped and accumulated during the wetter periods of the Sahara Desert.
Evidence also suggests that the Sahara Desert once flooded by a prehistoric lake, formed by the Nile River and covered more than 42,000 square miles and are known as ancient megalakes.
And below the sands and aquifers of the Sahara Desert there is also bedrock and also layers of dried out clay.
And some areas of the Sahara Desert still have underground rivers and lakes which are remnants of a time when the region was much wetter than it is now.
There is also evidence of human occupation under the Sahara Desert as archaeological discoveries, such as the Takarkori rock shelter in Libya, reveal that the Sahara was actually inhabited by humans which includes nomadic herders for thousands of years.
Even lost cities and civilizations have been found at the Sahara Desert.
Examples such as the Roman outpost of Timgad, once abandoned and later was buried by the Sahara desert show that human settlements existed in what is now the Sahara Desert.
The Sahara deserts dunes and the overall size is impressive, although what lies below the sand is the region's most astounding feature.
As there is the remnant of a massive lake which existed in the western Sahara desert around 250,000 years ago, which is deep below the sand.