Palawan used to be part of Southern Tagalog "B" or Mimaropa which groups it with the Mindoro provinces, Marinduque and Romblon.
Southern Tagalog "A" or Calabarzon, on the other hand, is comprised of Cavite, Laguna, Batangas, Rizal and Quezon.
President Arroyo earlier issued Executive Order No. 429 reorganizing Region 6 to include Palawan and Puerto Princesa City. Cecille Suerte Felipe