Look on the bright side! No, really – see how the left side appears brighter in color?

It's caused by differences in sand cover. The western side of Egypt’s Lake Nasser is covered by sand and the eastern side is mostly rock. https://go.nasa.gov/3rJy6ib

📷: @Space_Station astronaut
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The Two Banks of Lake Nasser

Differences in the amount of sand cover explains the starkly contrasting colors of the Egyptian lake’s west and east banks.

^go.nasa.gov