Yellow Melon is not the best name in the world for a melon. There are actually many melons that people refer to as a Yellow Melon.
Canary Melons are sometimes referred to loosely as Yellow Melon, as are Cavaillon Melons in France, even though their skin isn't really yellow at all.
Currently, though, Yellow Melon most often refers to melons with bright yellow smooth skin grown in Korea. See entry on "Korean Melons" (another wonderfully vague term.)
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