Confirms that the legend of the Golden City was real, shifting the crew's goal toward finding that gold.

This discovery vindicates "Liar" Mont Blanc Noland. The golden city he saw 400 years ago didn't sink into the sea; it was blasted into the sky by the Knock Up Stream . Key Revelations Significance Upper Yard = Jaya One Piece Episode 164

Establishes the political stakes of the arc, revealing Gan Fall as the rightful ruler of Skypiea. Confirms that the legend of the Golden City

Nami, Zoro, and Nico Robin investigate the strange composition of Upper Yard. They realize it is a "soil island," which is impossible for Sky Islands. By examining the ruins and the layout of the land, they discover that Upper Yard was originally the other half of Jaya Island . Key Revelations Significance Upper Yard = Jaya Establishes

Explains why there is dirt in the sky and connects the Sky Island to the blue sea world.