I was bored and looking around on Google Maps, and I found something like the picture below in Egypt (southwest). What are those circles?

Hello, this is farmland formed by artificial irrigation. It is not only found in Egypt, but can also be seen in Inner Mongolia and Xinjiang.

As for why it is round, it is because there is a circular sprinkler in the center of these fields, and the water spout can continuously rotate 360 ??degrees for sprinkler irrigation. The darker-colored parts of the grains grow better, while the lighter-colored parts barely grow due to lack of irrigation (usually time-sharing irrigation).

In the early 1950s, Americans invented the circular sprinkler, which has the advantages of saving water and adapting to various terrains. Today, it irrigates tens of millions of hectares of cultivated land, sand dunes and grasslands on all continents. , can be called a revolution in the history of world agricultural irrigation. It was once praised by the famous American science and technology publication "Scientific America" ??as "the circular sprinkler is the most significant agricultural machinery invention since tractors replaced farm animals."

The adjacent squares should also be fields, but with square sprinklers.