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References:

[1]. Wikipedia contributors. Nile [Internet]. Wikipedia, The Free Encyclopedia; 2006 Jul 10, 05:19 UTC [cited 2006 Jul 12]. Available from: http://en.wikipedia.org/wiki/Nile

[2]. Wikipedia contributors. Amazon River [Internet]. Wikipedia, The Free Encyclopedia; 2006 June 11, 02:29 UTC [cited 2006 June 12]. Available from:

[3]. Wikipedia contributors. Limpopo River [Internet]. Wikipedia, The Free Encyclopedia; 2006 June 3. 13:05 UTC [cited 2006 June 12]. Available from:

[4]. Wikipedia contributors. Rio Negro [Internet]. Wikipedia, The Free Encyclopedia; 2006 June 9. 23:32 UTC [cited 2006 June 12]. Available from: http://en.wikipedia.org/wiki/Rio_Negro.

[5]. Wikipedia contributors. Niger River [Internet]. Wikipedia, The Free Encyclopedia; 2006 Jul 9, 12:35 UTC [cited 2006 Jul 12]. Available from: http://en.wikipedia.org/wiki/Niger_River

[6]. Wikipedia contributors. Orange River [Internet]. Wikipedia, The Free Encyclopedia; 2006 June 9. 23:32 UTC [cited 2006 June 12]. Available from: http://en.wikipedia.org/wiki/Orange_River.

[7]. Wikipedia contributors. Kasai River [Internet]. Wikipedia, The Free Encyclopedia; 2006 Jun 30, 11:22 UTC [cited 2006 Jul 14]. Available from: http://en.wikipedia.org/wiki/Kasai_River.

[8]. Wikipedia contributors. Zambezi [Internet]. Wikipedia, The Free Encyclopedia; 2006 Jul 9, 04:26 UTC [cited 2006 Jul 14]. Available from: http://en.wikipedia.org/wiki/Zambezi

[9]. Wikipedia contributors. Okavango River [Internet]. Wikipedia, The Free Encyclopedia; 2006 Jun 28, 08:34 UTC [cited 2006 Jul 14]. Available from: http://en.wikipedia.org/wiki/Okavango_River.

[10]. Wikipedia contributors. Congo River [Internet]. Wikipedia, The Free Encyclopedia; 2006 Jun 28, 08:34 UTC [cited 2006 Jul 14]. Available from: http://en.wikipedia.org/wiki/Congo_River