 In 2019, with an annual population growth of 3.8%, half the population was less than 17 years old.In addition, as a result of massive illegal immigration from neighboring islands, 48% of the population are foreign nationals.The term "Mayotte" (or Maore) may refer to all of the department's islands, of which the largest is known as Maore () and includes Maore's surrounding islands, most notably Pamanzi (), or only to the largest island.