Simplify the following text for a Grade 6 native English-speaking person.
Original: The site is located in the southern Maya lowlands on a small island in Lake PetÃ n ItzÃ , now part of the Department of PetÃ n in northern Guatemala .
Simplified: The site is in the southern Maya lowlands on a small island in Lake PetÃ n ItzÃ . This island is now part of the Department of PetÃ n in northern Guatemala .