Malesia is a biogeographical region straddling the boundary of the Indomalaya and Australasia ecozones. Malesia was first identified as a floristic province that included the Malay Peninsula, Indonesia, the Philippines and New Guinea, based on a shared tropical flora derived mostly from Asia but also with numerous elements of the Antarctic flora, including many species in the southern conifer families Podocarpaceae and Araucariaceae. The floristic province overlaps four distinct mammalian faunal regions.