黄河流域

• 黃(yellow; ripe grain field)ASSOCIATIVE

A mature golden rice plant with its stalk, roots, and heavy drooping grain panicles forms the image of this character.

• 氵(water; liquid)RADICAL
• 可(can; allow)PHONO-SEMANTIC

A river is where water flows long, and the sound 'hà' suggests 'khả,' evoking nature's permission for water to flow.

• 氵(water)RADICAL
• 㐬(swirling flow; whirlpool)PHONETIC

Water flowing in a whirlpool becomes a stream, which is the circulation of water.