Waterfall in Sant Miquel del Fai (Catalonia)

Ingleton waterfall in Yorkshire (England)

Zoom on a waterfall at 1/2000th sec aperture speed (Galway, Ireland)

Waterfall near the small village of Runes in the Cévennes region (France) This photo is a stitching of several individual photos (see more such examples on the panorama page)

Tannforsen (Sweden)

Waterfall near Annascaul lake in Kerry (Ireland)

In Yosemite National Park (California)

Waterfall at the Devil's Bridge in Wales

near Luang Phrabang (Laos)
more photos with stamps here

Mullinhassig waterfall near Cork (Ireland)

Waterfall in Plitvice National Park (Croatia)

near Ballaghisheen Gap in Kerry (Ireland)

Voss waterfall, Sognefjord (Norway)

Waterfall near Mengma (Xishuangbanna, Yunnan, China)