Anticosti Island

Anticosti is an island in the North Atlantic Ocean, and according to the Animus is (or was) the world's largest privately owned area. In the mission, Tinker Sailor Soldier Spy, Shay, Liam, and Chevalier de Verendrye sail here to obtain the plans for the Puckle Gun, and the location of the Manuscript. Throughout the game, the island remains an Assassin fortress, until, that is, the now Templar Shay conquers it.