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The River Basin  
 Basin Landscape
 Soils of the Orange-Senqu River Basin
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The Orange Senqu is the largest river basin south of the Zambezi, covering an area of approximately 1,000,000 km². This transboundary river covers the entire area of Lesotho, a large part of South Africa and southern regions of Botswana and Namibia.The Senqu flows from its source near Thabana Ntlenyana (3 482 m) in the Lesotho highlands (the tenth highest peak in Africa), becomes the Orange River at the Lesotho border, traverses central and western South Africa, forms the southern border of Namibia, and finally joins the Atlantic Ocean near Alexander Bay.

The table below shows the land covered by the basin in the four riparian states of the Orange-Senqu River:

Table : Area and Percentage of the River Basin for the Four Riparian States

Country Area in each country(km²) Percentage of Basin
Botswana 79,000 7.9%
Lesotho 34,000 3.4%
Namibia 245,000 24.5%
South Africa 642,000 64.2%
Total 1,000,000  

Source: ORASECOM,2009

The basin is the most developed trans-boundary river basin in the SADC region, hosting much of the industrially developed parts of Southern Africa, and includes approximately 27 storage dams (Angula 2001:6). The management of water resources in the basin is required to address a host of interrelated issues, such as water quality, supply and pollution control, which will be described in more detail through out the River Basin and Resource Management themes. 

Chapter Summary

This chapter covers the following concepts and materials:

Golden Gate Park, South Africa.
Source:Hughes 2004
( click to enlarge )



Explore the sub-basins of the Orange-Senqu River

Tour video scenes along the Orange-Senqu River related to the River Basin

Investigate land cover and terrestrial ecoregions in the basin

Examine how the hydrologic cycle moves water through and around the earth

Explore the interactions of living organisms in aquatic environments

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