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Madeira Island

geography Maturity 7-9 Next article →

Madeira is a Portuguese island located in the Atlantic Ocean. It is the largest and most populous island in the Madeira Archipelago. As of 2021, the island had a total population of 245,595 people. The island includes several smaller areas like Ilhéu de Agostinho and Ilhéu de São Lourenço. It also includes Ilhéu Mole in the northwest. Madeira is a significant part of the region named after it.

The island is the visible top of a massive submerged shield volcano. This volcano rises from the floor of the Atlantic Ocean. The formation began over five million years ago during the Miocene epoch. This process happened along an east-west rift in the oceanic crust. This rift sits along the African Plate. The volcanic activity continued through the Pleistocene epoch until about 700,000 years ago. This long period of activity built the foundation of the island.

After the initial shield formed, the landscape changed through extensive erosion. This erosion created two large amphitheatres in the central part of the island. These amphitheatres are large, bowl-shaped structures that open toward the south. Following this period of erosion, volcanic activity resumed on the island. This later activity produced scoria cones and lava flows. These new features formed on top of the older, eroded shield. This created a complex landscape of different volcanic ages.

The most recent volcanic eruptions occurred in the west-central part of the island. These eruptions took place only 6,500 years ago. They created more cinder cones and lava flows across the terrain. During the end of this eruptive phase, an island surrounded by reefs was formed. Marine vestiges of this period remain visible today. You can find a calcareous layer in the Lameiros area of São Vicente. People later explored this area for the production of calcium oxide.

Madeira has specific dimensions and a varied mountain ridge. The island is 57 km long from Ponta de São Lourenço to Ponta do Pargo. At its widest point, it measures approximately 41 km from Ponta da Cruz to Ponta de São Jorge. The total coastline is 140 km long. A mountain ridge extends along the center of the island. The highest point on the island is Pico Ruivo. Other major peaks include Torres, Arieiro, Cidrão, Cedro, Casado, Grande, and Ferreiro. The eastern extent of the island is much lower, staying below 1,000 meters.

The island's geography creates many difficult environments. Steep sea cliffs, such as Cabo Girão, rise from the coast. Deep valleys and ravines also extend from the central mountain spine. These features make the interior of the island generally inaccessible to people. The terrain is rugged and shaped by both volcanic forces and water. This makes the center of the island very different from the coastal areas.

Human life on Madeira is closely tied to its physical geography. Daily life is concentrated in many villages located at the mouths of the ravines. These ravines are important for moving water across the island. Heavy rains usually fall during the autumn and winter seasons. This water travels through the ravines to reach the sea. Because the interior is so difficult to reach, the coastal village locations are vital for the population.

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