Geography.

Physical setting:
São Paulo is located in Southeastern Brazil, in southeastern São Paulo State, approximately halfway between Curitiba the Capital of Paraná State, previously part of São Paulo State and Rio de Janeiro, formerly capital of Brazil and now capital of the State which bears the same name. The city is located on a plateau that is part of the Serra do Mar (Portuguese for "Sea Range"), itself a component of the vast region known as the Brazilian Highlands, with an average elevation of around 799 metres (2,621 ft) above sea level, though at a distance of only about 70 kilometers (43 mi) from the Atlantic Ocean. This distance is covered by two highways, the Anchieta and the Imigrantes, (see "Transportation" section below) that roll down the range, leading to the port city of Santos and the beach resort of Guarujá. Rolling terrain prevails within the urbanized areas of São Paulo except in the North of the city, where the Serra da Cantareira Range boasts higher elevations and a sizable remnant of the Atlantic Rain Forest. The entire region is very stable tectonically, and no significant seismic activity has ever been recorded.
See also: Water management in the Metropolitan Region of São Paulo
The Tietê River, and its tributary, the Pinheiros River were once important sources of fresh water and leisure for São Paulo, only to become grossly polluted by raw sewage and industrial effluents in the latter half of the 20th century. However, a substantial clean-up program for both rivers is underway, financed through a partnership between local government and international development banks such as the Japan Bank for International Cooperation.[15] Neither river is navigable in the stretch that flows through the city, although water transportation becomes increasingly important on the river Tietê further downstream (towards South, near river Paraná), as the river is part of the River Plate basin.
There are no large natural lakes in the region, but the Billings and Guarapiranga reservoirs in the southern outskirts of the city are used for power generation, water storage, and leisure activities, such as sailing. The original flora consisted mainly of a great variety of broadleaf evergreens. Today, non-native species are common, as the mild climate and abundant rainfall permit a multitude of tropical, subtropical and temperate plants to be cultivated, with eucalyptus being especially ubiquitous.