The dP Salsa covers a geographical area of great value for biodiversity that has been highlighted since the end of the 19e century, as shown in the thematic map. Within this context, the map also illustrates the coherence between the countries involved in the construction of the dP: the Philippines, Malaysia, Indonesia, etc. This thematic map illustrates biodiversity jumps which suggest a zone of interest where high biodiversity meets high human pressure. The thematic map presented here is simplified from Raes & van Welzen, in Blumea 54, 2009, 6-8(3). Zollinger (1887) first observed a zone of unusually high biodiversity in between Asia and Oceania, and called it the "Malesian floristic region", and its the delimitations were precised by Van Steenis (1948, 1950) with three demarcation knots (North to peninsular Malaysia from 375 to 200 genera, north to Philippines from 421 to 165, and between papua New Guinea and Australia from 644 to 340). The numbers indicate the number of botanic genera that do not crossing the knots, illustrating a higher endemicity within the zone. The green lines indicate ecotones separating biogeography zones between asia and oceania, with the Wallace lines and the eastern and western variants by different authors. The "Zollinger" zone correspond to the countries represented in yellow. The "Wallacea" zone varies a lot according to authors, but is often understood as a smaller zone comprising Sulawesi and Molucca archipelagoes.