municipalities and each of the barrios within said municipalities and the corresponding barrio names. Said map and list of barrio names constitute the officially established primary legal barrio divisions. However, often the word "barrio" is also (mistakenly) used in Puerto Rico in an unofficial manner to represent a populated sector within a barrio, and in this latter case the name of the sector can be—and most often is—different from the official barrio where it is located. An example of this non-official usage is the reference to Puerto Rican nationalist Don Pedro Albizu Campos as having been born in barrio Tenerias in Ponce yet, there has never been a barrio Tenerias in Ponce; Tenerias is a populated sector—a settlement—of barrio Machuelo Abajo. The problem is that populated places have been adopting names for themselves that do not appear in the official government maps, because such maps have not been updated, and there is no system in place for such updates. Quality control and GPS plotting Puerto Rico barrio boundaries were established using landmarks such as "the top of a mountain", "the lot owned by Franscico Mattei", "the peak of a mountain ridge", "an almond tree" (árbol de húcar), and "to origin of Loco River". When describing the boundaries of Las Piedras, the official 1952 document by the Puerto Rico Planning Board stated "the border continues through Cándido Márquez's and Jesús Barrio's farms until reaching a mamey tree. This tree is about 50 meters south of Leoncio Rivera's home..." As these descriptors tended to lend themselves to ambiguity and other problems, there was a 2002 initiative by the University of Puerto Rico to describe boundaries using GPS technology. The GPS coordinates of barrios of Puerto Rico are available via a Puerto Rico government portal. See also List of communities in Puerto Rico List of barrios of Ponce, Puerto Rico Pueblos in Puerto Rico Notes References Puerto Rico Populated places in Puerto Rico