São Luís

São Luíz do Piratininga (first part, Portuguese for Saint Louis, last part Tupi clear water) is a municipality (município) in the eastern part of the state of São Paulo in Brazil. Its latitude is 23.33/23°13'18" S and the longitude is 45.305/45°18'36" W. The population in 2004 is 10,689, the density is 17.28/km² and the area is 618.62 km². The elevation is 730 m. This place name Paraitinga comes from the Tupi language (Parahytinga) meaning clear water).

The superhighway linking the cities of São Paulo and Rio de Janeiro is near this municipality. The southern part of the municipality are heavily forested and are part of the Serra do Mar mountain range. The rest of the area are farmlands and the northern part are hilly and mountainous.