Gengoro Island is the island where Penguin Village is located.
This island is mostly composed by grassy plains, but some hills and small lakes can also be found here.
Big City Island
Big City Island (also known as Metropolis Island in the japanese version) is an island with futuristic city full of intelligent people and the original home town of Charmy Yamada and Skop.
Wonder Island is a strange island where many creatures mostly based off Japanese fairy tails live. It is the primary setting of Akira Toriyama's first manga Wonder Island. Senbei and Arale once came here to obtain a tear from the ogre king Gyaska.