Even on the planet Mars, the size of Belgium is used for measurement as seen in this report from the European Space Agency (7 January 2026).

“The ridges, mounds, or columns left standing when the surrounding ground is eroded away are technically known as yardangs, and are common on Mars. They’re evidence of powerful martian winds acting as a cosmic sandblaster, pulling sand grains into the air and sculpting grooves in the surface that extend across tens of kilometres.”

“In the main image, which covers a patch of ground almost the size of Belgium, the yardangs all slant in the same direction due to the prevailing wind, curving in from the bottom left (south-east). They sit at the northern end of the Eumenides Dorsum mountains”