Many of the Peruvian toponyms have Indigenous sources. In the Andes communities of Ancash, Cusco and Puno, Quechua or Aymara names are overwhelmingly predominant. Their Spanish-based orthography, however, is in conflict with the normalized alphabets of these languages. According to Article 20 of ''Decreto Supremo No 004-2016-MC'' (Supreme Decree) which approves the Regulations to Law 29735, published in the official newspaper El Peruano on 22 July 2016, adequate spellings of the toponyms in the normalized alphabets of the Indigenous languages must progressively be proposed with the aim of standardizing the naming used by the National Geographic Institute ''(Instituto Geográfico Nacional, IGN)''. The National Geographic Institute realizes the necessary changes in the official maps of Peru.