Kotoritana Republic

The Kotoritana Republic is a location that is roughly as big as Greed Island.

Overview
The size of the Kotoritana Republic is speculated to be as big as Greed Island.

Greed Island arc
Phantom Troupe member Shalnark uses the Kotoritana Republic as a tantamount size of Greed Island.

Trivia

 * The size of both Greed Island and the Kotoritana Republic is equal to the real-life Japanese island Hokkaido, which is 83,000 SQ. MI.