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 its bizarre weather phenomena.
The weather conditions in the Maubeugemour Sea is outrageous, which includes mirages, giant 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 sea also possesses a unique current known as the Thrust Up Stream, a scaled down version of the Knock Up Stream. It's power is enough to lift up a war ship, and though it appears briefly, it has a high frequency of appearances in a given area.
- In French, "Mauvaise humeur" (Maubeugemour) means "Bad temper".