The island where Luffy discovers the lost city of gold is called Jaya (also known as Skypiea or Upper Yard) ¹ ². The lost city is called Shandora (also known as El Dorado), and it was launched into the sky by the Knock Up Stream ¹ ². Luffy and his friends search the city for gold, but Enel, the ruler of Skypiea, has already mined all the gold from Shandora ¹ ².
