The division of the world into 5 major areas which are subdivided into 22 regions follows the groupings of countries used by the United Nations Statistics Division in its reporting. See: http://unstats.un.org/unsd/methods/m49/m49regin.htm
Papua New Guinea has the most languages, with 836 living languages. Indonesia comes in second, with 706 living languages. Third place goes to Nigeria, having 522 living languages.
Papua New Guinea with 836 living languages
Browse the Country Indexes to find the languages in which you are interested, and follow the links to available publications.