Kansorn Island is also known as Little East Blue by it's inhabitants. The majority of it's citizens are from the East Blue and worship the Straw Hat Pirates as heroes.
The Kansorn Island has only appeared in the One Piece anime in filler episodes that were connected as a special with the coming One Piece movie, Strong World. The events of this island supposedly occurred days before the events of the tenth One Piece movie.
The island holds several landmark sections that just so happen to have some connection to each of the Straw Hat Pirates.