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By the 1940s and ’50s, São Paulo was aptly referred to as the locomotive “pulling the rest of Brazil” and has since become the hub of an immense megametropolis.
Only when coffee became Brazil’s vital export crop in the last decades of the 19th century did São Paulo become a major centre of economic activity with concomitant population growth.
In their course, they cross stratified sandstones and limestones overlaying the crystalline base, as well as sheets of volcanic rock that form the Paraná Plateau.
Here, rapids and waterfalls, as well as dams and reservoirs, supply great quantities of hydroelectric power.
It also continues to attract people from the country’s rural regions in a flow that constantly feeds the bottom of the social pyramid as life improves for those already there.
Tietê, on which São Paulo is located, rise near the edge of the Great Escarpment and flow generally westward to the Paraná River.
The city is located on a plateau of the Brazilian Highlands extending inland from the Serra do Mar, which rises as part of the Great Escarpment only a short distance inland from the Atlantic Ocean.