Brazilian Highlands

Lore & Background

The Brazilian Highlands were formed by ancient basaltic lava flows, though no seismic or volcanic activity occurs today. Erosion has shaped the region extensively, creating sedimentary deposits and wearing down mountains. The highlands are recognized for great diversity, containing several biomes, vastly different climatic conditions, many soil types, and thousands of animal and plant species.

Reader's Guide

The Brazilian Highlands are significant as the geographical core of Brazil, containing the majority of the country's population and covering roughly half its land area. The highlands' legacy lies in their role as the demographic and ecological heart of Brazil, with immense biodiversity and varied landscapes.

Did You Know?

• The Brazilian Highlands cover approximately 4,500,000 km², or about half of Brazil's land area.
• The Atlantic Plateau was once almost completely covered by the Atlantic Rainforest, of which only 7.3% remains.
• The Central Plateau was approximately 85% once covered by cerrado vegetation, of which only a small portion remains intact.
• The Southern Plateau features fertile 'purple land' from basaltic lava spills.

Definition and Physical Characteristics

A plateau, sometimes called a high plain or tableland, is fundamentally a stretch of elevated, level terrain that stands sharply above the landscape surrounding it on at least one side. The edges of these formations frequently feature deep escarpments or rolling hills that mark the boundary between the flat interior and the lower country beyond. The top surface can vary dramatically in width—some present only a modestly flat crown, while others spread across vast expanses. In the broader fields of geology and physical geography, these landforms represent one of the most recognizable features of Earth's surface, connecting volcanic, tectonic, and erosional processes into a single visible structure. The term itself traces back to the French word "plato," and the plural can appear as either "plateaus" or "plateaux" depending on convention. Whether small and localized or continent-spanning, every plateau shares this core identity: a raised, relatively flat surface set apart from its neighbors by steep or gradual transitions in elevation.

Formation Mechanisms

Plateaus arise through several distinct geological mechanisms. Volcanic activity is one primary driver: magma rising from the mantle can cause the ground to swell upward, lifting large, flat rock surfaces into elevation. Alternatively, lava extruded from cracks and weak zones in the crust can build up layered rock over time, as seen in formations like the Deccan Plateau in India, the Columbia Plateau in the United States, and the Antrim Plateau in Northern Ireland. Tectonic plate movements offer another pathway, producing plateaus that tend to be considerable in size and remarkably uniform in altitude; the Meseta Central on the Iberian Peninsula exemplifies this type. A third mechanism is erosion—glaciers carving through mountain ranges or water wearing down peaks can leave behind flat-topped remnants nestled between higher terrain. In extreme cases, rivers dissect a plateau into deeply cut, narrow valleys, creating what geologists call a dissected plateau, a pattern clearly visible in the Scottish Highlands.

Classification by Surrounding Environment

Geographers sort plateaus into three categories based on what borders them. Intermontane plateaus sit enclosed by fold mountain ranges and tend to be among the highest and most extensive on the planet. The Tibetan Plateau, wedged between the Himalayas and the Kunlun Mountains, and the Altiplano, nestled between two Andean ranges, are prime examples of this enclosed type. Piedmont plateaus occupy a transitional position, flanked by mountains on one side and a plain or sea on the other; the Piedmont Plateau in the eastern United States, stretching between the Appalachians and the Atlantic Plain, illustrates this arrangement well. Continental plateaus, by contrast, are ringed entirely by plains or oceans and develop independently of any nearby mountain system. The Antarctic Plateau in East Antarctica serves as a striking example of this third type, existing as a vast elevated surface with no surrounding highlands to define its edges.

Major Examples Across Continents

The world's most notable plateaus span every inhabited continent. In Africa, the Ethiopian Highlands dominate the central part of the country, forming the largest continuous high-altitude area on the continent, with most of its surface above 1,500 metres and peaks reaching 4,556 metres—earning it the nickname "Roof of Africa." The Highveld in South Africa, sitting between roughly 1,500 and 2,100 metres, supports some of the nation's largest urban clusters. In Asia, the Tibetan Plateau reigns as the largest and highest, covering about 2.5 million square kilometres at roughly 5,000 metres elevation, still being shaped by the ongoing collision of the Indo-Australian and Eurasian plates. Its height is sufficient to alter Hadley cell convection and drive Indian monsoons southward. In North America, the Colorado Plateau spans approximately 337,000 square kilometres across four U.S. states, and the Grand Canyon within it formed over millions of years as the Colorado River eroded downward at nearly the same pace the land rose—about a centimetre per year.

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