What island is the main setting after the crash in Mega Man Legends?

The main setting after the crash in Mega Man Legends is Kattelox Island.

Mega Man Volnutt begins the game exploring a tower ruin over the ocean with his companions aboard the airship Flutter. Engine trouble forces the Flutter to crash-land on Kattelox Island, leaving Mega Man, Roll Caskett, and Barrel Caskett searching for parts to repair the ship.

Kattelox is more than a temporary stop. Its city, forests, lakes, and underground ruins form the game's interconnected setting. The island is also targeted by the Bonne family, a group of air pirates searching for its legendary treasure. Mega Man becomes involved when the Bonnes attack the island's people and settlements.

The island's ruins contain Quantum Refractors, valuable energy sources used by the future society of the Legends setting. Deep inside Kattelox's Main Gate, Mega Man encounters Mega Man Juno and learns about the dangerous Carbon Purification Process. Doppler Island belongs to another Mega Man context, while Nino Island is associated with Mega Man's earlier history rather than the crash-site setting.