Fishman Island is an underwater island which dwells 10,000 meters under the sea level, in a giant hole that goes under the Red Line. It serves as an underwater gateway to the New World for those who do not wish to cross over the Red Line above.
Jungle Island is an island located somewhere in the Grand Line. It's home for many strong & wild animals. But it seems that many strong people also inhabitate or visit this island oftenly.
Karakuri Island is an island in the New World part of the Grand Line which resides the Future Country Barujimoa. The kingdom specializes in advanced technology, such as cyborgs and mechanical structures.
Namakura Island is a place in the Grand Line that is called Harahettania. The Land of Poverty. The place is completely ravaged and the people there live in destitution. The turmoil of the country can be largely attributed to the Longarm Tribe.
Kuraigana Island is a dark and gloomy place in the Grand Line. It was once the home of the now fallen Shikkeāru Kingdom. This island is also the residence of Juracule Mihawk.
Baltigo, labeled as the "Land of White Soil", is an island located somewhere in the New World. It have been a base belonging to the Revolutionary Army for at least 10 years.