The Nile. With 6700 kilometers the worlds longest river. Its journey to the Mediterranean Sea takes 3 months.
We rafted 30 Km including several grade 5 rapids! Great fun. We used Nile River Explorers - great guides, safe and professional, lovely food, cold beers, cool campsite overlooking Bujagali Falls. We have video from the ride but no photos - check NRE to see what white water looks like.