What is the name of the island featured in Forza Horizon 4's Fortune Island expansion?

The island featured in Forza Horizon 4's Fortune Island expansion is called Fortune Island. It is a fictional, highly rugged setting created for the game's first major expansion.

Fortune Island was released on 13 December 2018 for Xbox One and Windows. Its landscape contrasts with the main game's fictionalised version of Great Britain, featuring steep cliffs, forests, dramatic mountain roads, storms, lightning, and views of the aurora borealis.

The expansion builds its activities around exploration and treasure hunting. Players solve riddles, locate treasure chests, and take part in new races and challenges, including Trailblazer events that emphasise route choice and rapid driving. Locations such as Fenholm's sunken village and the mountain road at Needle Climb help give the island its distinctive identity. Paradise Island, Skull Island, and Treasure Island are plausible-sounding distractors, but they are not the expansion's name.