Simplify the following text for a Grade 6 native English-speaking person.
Original: The island has an area 3056 kmÂ ( 1180 square miles ) and is 100 km south of the island of Cuba , across the Gulf of BatabanÃ .
Simplified: The island has an area 3056 kmÂ ( 1180 square miles ) and is 100 km to the southwest of mainland Cuba . It lies across the Gulf of BatabanÃ .