KanjiJLPT N2
Source

source, origin

Mnemonic

A violent storm sweeps across the meadow, tearing the ground open. Where lightning struck, water now bubbles up from deep below — you've just witnessed the birth of a river's source. Every great stream begins right here, where storm met meadow.
Additional thoughts
Picture the lightning cracking the earth like an eggshell, releasing hidden underground water. The meadow becomes the cradle of a newborn river. Storm energy unlocks what was buried.
Quick recall
A storm cracks open a meadow, unleashing a river's source from underground.

Details

The keyword for 源 is source. This kanji refers to the origin or fountainhead from which something springs, particularly the source of a river or stream. By extension, it conveys the idea of a root cause, origin, or fundamental beginning of anything, whether physical or abstract. It carries the sense of tracing something back to where it first emerges or originates.
On'yomi
げん
Kun'yomi
みなもと