Imperial Cumulus

A Sekiteiun (積帝雲) is an ancient fossilized cloud which remains in the sky. It serves as the base for the White and White-White Seas, the oceans where Skypiea is located 10,000 meters above (blue) sea level.

It was first mentioned in Chapter 229 and Episode 149. In the Funimation dub, it is called Cumuloregalis and in the Viz manga it is called Imperiocumulus.

Overview
According to Montblanc Cricket's theory, the Sekiteiun is a mass of clouds so dense and ancient that it could be described as "petrified". Because of this density, the Sekiteiun does not have an atmospheric current and can never condense into rain, but it still manages to float on the sky somehow. It appears to be always on the move around the seas of Jaya, and, with luck and good timing, it is possible to travel into the Sekiteiun by riding the Knock Up Stream once it is aligned with the cloud mass.

Also, due to it being so dense, sunlight cannot penetrate it, meaning that any region in the Blue Sea caught below the Sekiteiun's range will darken nearly instantly, almost as if nighttime had suddenly came. Very rarely, a mysterious phenomenon will happen where gigantic silhouettes appear among the clouds, but this has been explained as merely the result of the shadow of someone up in the Sekiteiun being projected down to the Blue Sea due to strong sunlight.

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