Plateau (Geography): Elevated Flatlands, Types, Formation, and Uses

Key characteristics

Typical features of plateaus include a broad flat or gently undulating top, steep edges or escarpments, and a clear elevation contrast with adjacent lowlands. Their tops may be cut by rivers and valleys, producing a broken surface in some areas. Plateaus can be isolated or form part of a larger mountainous or highland system. Small, isolated remnants of plateau surfaces are commonly called mesas or buttes when reduced by erosion.

Types and examples

• Uplifted plateaus: formed by tectonic forces that raise large blocks of the crust; many continental plateaus belong to this category.
• Volcanic and lava plateaus: created by successive flows of lava that build up wide, flat surfaces; these are often described as volcanic plateaus (volcanic plateau).
• Dissected (or eroded) plateaus: where river incision and weathering break the once-continuous surface into ridges and valleys; heavily eroded examples may be called disconnected plateaus (disconnected plateau).
• Submarine plateaus: broad, raised regions on the ocean floor such as the Ontong Java Plateau; continental fragments beneath shallow seas include formations like the Seychelles plateau (submarine plateau) and (Seychelles plateau).

Common continental examples include the Deccan Plateau (India), the Colorado Plateau (United States), the Altiplano (Andes), and the Ethiopian Plateau. Each shows a mix of tectonic uplift, volcanic activity, and erosion in its development.

Origins and development

Plateaus arise through several geological processes. Tectonic uplift raises broad areas of crust; large-scale volcanic eruptions and successive lava flows can construct flat highlands; long-term erosion can isolate and flatten surfaces originally formed by other processes. Over geological timescales, a plateau’s edges are worn back, rivers carve valleys, and isolated remnants may become smaller landforms.

Uses, importance, and distinctions

Plateaus have practical and ecological significance. They provide grazing land, agricultural terraces, mineral deposits, and sites for human settlement and transport routes. High plateaus can affect weather patterns—most famously the Tibetan Plateau’s role in shaping Asian monsoons—and host distinct ecosystems and endemic species. In terminology, plateaus differ from plains (low, flat areas) and from mesas or buttes (smaller, isolated flat-topped hills). The plural of plateau may be written as plateaus or plateaux (plateaux/plateaus), reflecting alternate spelling traditions.