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Was the Sahara a forest before?
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The Sahara used to be a forest-

Sahara desert is the largest desert in the world, with the worst natural conditions. Incredibly, however, as early as 1 100 million years ago, the Sahara desert was once a green tropical paradise with rich forests and water resources! British and Irish scientists recently discovered the remains of a "prehistoric behemoth river" during an archaeological expedition in the Sahara desert. Scientists excavated the fossil remains of several prehistoric behemoths in this place.

According to scientists' speculation, about 6,543.8 billion years ago, the Sahara Desert was once a green paradise with dense forests and rivers. This "prehistoric river" is about as wide as the Danube, and its banks were once covered with lush forests and wide lakes. What shocked scientists even more was that there were many huge "prehistoric behemoths" living in the river and on the shore at that time-including crocodiles 18 meters long, herbivorous dinosaurs at least 20 meters long, prehistoric giant fish with scales as wide as 5 cm and pterosaurs with wingspans as long as 6 meters.