Kabbalah к Берешит 2:11

"And Abram went down to Egypt to sojourn there" (Gen. 12:10). Why did he go down to Egypt? Because it looked like the garden of Hashem (Gan Eden). As it is written, "like the garden of Hashem, like the land of Egypt..." (Gen. 13:10). Because a river flows down on the right, as it is written, "The name of the first is Pishon; that is it which encompasses the whole land of Chavilah, where there is gold" (Gen. 2:11).

As Rabbi Yosi said, So the water containing the drops comes from the most ancient of four rivers, as it is written, "The name of the first is Pishon" (Gen. 2:11). Why is it written, "the name of the first is Pishon?" Pishon is different from the rest because it flows into the land of Egypt. Therefore, the wisdom of Egypt is greater than that of the rest of the world.