What is Cuba island called?

The official area of the Republic of Cuba is 109,884 km2 (42,426 sq mi) (without the territorial waters). The main island of Cuba is the largest island in Cuba and in the Caribbean, with an area of 104,556 km2 (40,369 sq mi).

There is another Cuba?

There is only one mainland in Cuba. Isla de la Juventud is the second-largest Cuban island.