What is the world's only natural feature that can be seen from the moon?

Answer 1

The Great Barrier Reef is a natural construction that can be seen from space.

I think you mean non-natural, and that would be the Great Wall of China, I think. but I'll answer the question as posted: You can see the oceans from the moon, and the continents, and clouds.

Answer 2

The Great Wall of China is often cited as the only human-made structure that can be seen from the moon with the naked eye. However, this is a common misconception, as no human-made structures are visible from the moon. The only natural feature that can be seen from the moon is Earth itself.