The Maubeugemour Sea (モベジュムール海域 Mobejumūru Kaiiki?), also known as the Ill-Tempered Sea (不機嫌海域 Fukigen Kaiiki?), is a non-canon sea at the start of New World, known for weather phenomena that are unmatched in strangeness and danger (at least outside of the New World). These include mirages, raindrops, and hailstones larger than warships, snowfall like an avalanche, and the ocean separating to leave spontaneous trenches. Less outrageous phenomena include heavy rainstorms and sweltering heat. This weather, like in the first half of the Grand Line, can change from one to another in a matter of seconds.
The weather conditions in the Maubeugemour Sea are said to be outrageous, with giant rain falling from the sky and holes appearing in the ocean.
- In French, "Mauvaise humeur" (Maubeugemour) means "Bad temper".