Local tour guides say Murchison Falls is the most powerful waterfall in the world. While that claim isn't actually true, when you see the 100-meter wide raging, class 5 whitewater-filled Nile river squeeze down to shoot the 7 meter-wide gap in the rocks, you can easily see how they might believe that.
Between using a small aperture and a ND filter, I accomplished a longish exposure that blurred the water nicely despite it being bright mid-day light.
Location: Murchison Falls National Park, Uganda
Lens used: 24-105mm f4.0 IS w/Vari-ND Duo filter