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Posts tagged Betsiboka River

Soil Erosion in Madagascar

15.8S 46.2E

January 4th, 2013 Category: Deforestation, Rivers, Sediments

Madagascar – December 30th, 2012

The red color of the Betsiboka River and Bombetoka Bay into which it flows (top edge) demonstrate one of Madagascar’s greatest environmental problems — soil erosion. Deforestation of Madagascar’s central highlands has resulted in widespread soil erosion, which in some areas may top 400 tons/ha per year.

For Madagascar, a country that relies on agricultural production for the foundation of its economy, the loss of this soil is especially costly.  The removal of the native forest for cultivation and pastureland during the past 50 years has led to massive annual soil losses approaching 112 tons per acre (250 metric tons per hectare) in some regions of the island, the largest amount recorded anywhere in the world.

Mayotte and Sediments from Sofia and Betsiboka Rivers Off Coast of Madagascar – September 21st, 2012

14.7S 46.8E

September 21st, 2012 Category: Image of the day, Rivers

Madagascar – September 16th, 2012

Rivers along the coast of Madagascar release rusty red sediments into the Mozambique Channel. Here, sediments can be seen spilling forth from the Sofia River (center, right) and the Betsiboka River (center, left). The sediments’ distinct red color is due to the red lateritic soils in Madagascar’s central highlands.

Visible by the top edge of the image is Mayotte, an overseas department and region of France consisting of a main island, Grande-Terre (or Mahoré), a smaller island, Petite-Terre (or Pamanzi), and several islets around these two. The archipelago is located in the northern Mozambique Channel in the Indian Ocean, namely between northwestern Madagascar and northeastern Mozambique. Mayotte’s area is 374 square kilometres (144 sq mi) and, with its estimated 194,000 people, is very densely populated (520 /km2 or 1,300 /sq mi).

Bombetoka Bay on Madagascar Coast – July 6th, 2011

15.8S 46.2E

July 6th, 2011 Category: Rivers

Madagascar - June 20th, 2011

This wide-swath ASAR image shows the northeastern coastline of Madagascar. Visible at the center of the coastline is Bombetoka Bay, a bay on the northwestern coast of Madagascar near the city of Mahajanga, where the Betsiboka River flows into the Mozambique Channel.

Numerous islands and sandbars have formed in the estuary from the large amount of sediment carried in by the Betsiboka River and have been shaped by the flow of the river and the push and pull of tides.

Rivers Along West Coast of Madagascar

16.6S 44.4E

July 21st, 2010 Category: Lakes, Rivers

Madagascar - July 4th, 2010

Madagascar - July 4th, 2010

Upon opening the full version of this image, the entire western half and coastline of Madagascar can be observed. Several rivermouths can be seen along the shoreline, emptying sediments into the Strait of Mozambique.

Here, most of the sediments are flowing forth from the Sambao River, whose mouth is just below the westernmost point on the island. Following the coastline northwards, the mouths of the Betsiboka River (below) and the Sofia River (above) can also be seen, although these rivers are releasing few sediments at the moment.

Moving southward down the coast, several other rivers appear as light tan lines across the landscape. One of the longest of these  is the Mangoky, whose mouth is situated near a greenish body of water, Lake Ihotry.

Red Sediments from Sofia and Betsiboka Rivers, Madagascar

15.3S 47.0E

May 23rd, 2010 Category: Rivers, Sediments

Madagascar - April 28th, 2010

Madagascar - April 28th, 2010

Madagascar is an island nation in the western Indian Ocean off the southeast coast of Africa. The island is the world’s fourth largest, about 975 mi (1,570 km) long and 355 mi (570 km) wide. It is separated from the African coast by the Mozambique Channel.

Here, rusty red sediments from the Sofia River (above) and the Betsiboka River (below) can be seen spilling into the Mozambique Channel. The sediments’ distinct red color is due to the red lateritic soils in Madagascar’s central highlands.