Outcast Island

Outcast Island is an island from the Barbaric Archipeligo populated by the Outcast Tribe and their leader Alvin the Treacherous.

Location
While the location of the island is never specified, it clearly takes place in the Barbaric Archipeligo less than a day away from Berk.

Characteristics
In a startling constrast to their enemy island Berk, Outcast is comparatibly smaller and lifeless. This island is rocky, barren, and full of wild dragons which makes living extremely difficult for the Outcasts.

From the shape of the mountain in the island and the type of rock it is made from, it is possible that the island is a comparatibly newer island formed from fresh volcanic rock, the mountain that very same volcano laying dormant.