Earth from space: Shapeshifting rusty river winds through Madagascar's 'red lands'

This striking astronaut photo shows the intense color and intricate shape of Madagascar's Betsiboka River as it meanders through an archipelago of mangrove islands that have helped to stabilize and reshape the waterway as destructive human practices push it to the brink of collapse.


The Betsiboka stretches around 326 miles (525 kilometers) from one of Madagascar's central highlands to Bombetoka Bay on the island nation's northwest coast. As it approaches the sea, the river splits apart, forming a network of braided waterways, known as a delta, as the discolored water is diverted around a series of small islands.


These lemon-shaped islands are made of sediment held together by the deep intertangled roots of mangrove trees. Some of the larger islands have visible erosion features near their center where water has trickled through the stubborn trees, according to NASA's Earth Observatory. Without the roots, the islands would be quickly washed away by the river, which could destabilize the surrounding ecosystem.
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The Betsiboka delta is often referred to locally as the "red lands" due to the dark orange hues of the flowing water. This striking color is the result of heavy staining from soil rich in rust-like iron oxides, known as laterite, according to NASA's Earth Observatory.

The color of the Betsiboka naturally intensifies when heavy rains from tropical storms wash more laterite from the surrounding land, according to Europe's Copernicus program. However, human activity is also changing the river.

Since 1950, around 40% of Madagascar's forest cover has been destroyed by wildfires, agricultural grazing and "slash and burn" clearances, according to NASA's Earth Observatory. As a result, the Betsiboka now runs across more unstable ground, making it easier for more sediment to be swept away by the river.

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