Gyoncorde Plaza

Gyoncorde Plaza (ギョンゴルド広場) is a notable location within the center of Fishman Island, specifically within the Ryugu Kingdom. It was first named in a flashback in Chapter 626.

Otohime's Speeches
Thirteen years before the start of the series, Queen Otohime would approach Gyoncorde Plaza everyday to make her speeches about how humans and fish-folks should be united. She chose to make personal appearances in order to remove the boundaries between herself and the people, in order to increase influence. The signatures for her petition were kept in a box in the center of Gyoncorde Plaza, where people were free to drop them in or retract them. After returning with a World Noble's support, Otohime managed to get far more signatures than the box could hold, but one day the box was set ablaze by a human pirate, who then shot Otohime in the heart in the midst of the chaos.

Fishman Island Arc
When Hordy Jones and the New Fishman Pirates took over Ryugu Palace, they declared that in three hours after the takeover, they would execute the King, Neptune, in the plaza, in order to cement Hordy the position as the new king.