Eric Baccega / Grizzly bear (Ursus arctos horribilis) catching salmon in Brooks river, Katmai National Park, Alaska, USA, July

Juan Carlos Munoz / Detail in frozen waterfall. Selijalandfoss waterfall, Southern Iceland, Europe, March 2011.

Niall Benvie / Waterfalls in woodland. Craigengillan Estate, Dalmellington, Ayrshire, October.

Peter Cairns / 2020VISION / River Affric flowing through a rocky gorge, Glen Affric National Nature Reserve, Scotland, UK, October 2012.

Ben Lascelles / Great Dusky Swift (Cypseloides senex) Birds flying past rainbow created by waterfalls, Iguazu National Park, Argentina, October 2008

Peter Cairns / Woman standing in front of Skogafoss waterfall, Iceland. Model released.

Peter Cairns / Fulmar (Fulmarus glacialis) in flight in front of Skogafoss waterfall, Iceland, June

Jack Dykinga / Shore Acres State Park with sandstone bluffs being pounded by tidal shifting surf, creating waterfalls over concretions in the stone. Oregon

Yukihiro Fukuda / Japanese giant salamander (Andrias japonicus) moving upstream to spawn, Japan, August

Will Watson / Two men crossing a cloud forest river in spate, Jama Coaque Reserve, Manabi Province, Ecuador, February 2012. No release available.

Ben Hall / 2020VISION / Grey heron (Ardea cinerea) beneath waterfall. Ambleside, Lake District, UK, November. Highly commended, 'Habitat' category, British Wildlife Photography Awards (BWPA) competition 2012. Did you know? I...

Andy Rouse / 2020VISION / Sgwd Isaf Clun-gwyn waterfall and rapids. Ystradfellte, Brecon Beacons National Park, Wales, November 2011.

Andy Rouse / 2020VISION / Sgwd Isaf Clun-gwyn waterfall and rapids. Ystradfellte, Brecon Beacons National Park, Wales, November 2011.

Andy Rouse / 2020VISION / Sgwd Isaf Clun-gwyn waterfall. Ystradfellte, Brecon Beacons National Park, Wales, November 2011.

Andy Rouse / 2020VISION / Autumn leaves on mossy rock in front of Sgwd Isaf Clun-gwyn waterfall. Ystradfellte, Brecon Beacons National Park, Wales, November 2011.

Jack Dykinga / Cibecue Creek waterfall pouring through canyon narrows, White Mountain Apache Reservation, Arizona, USA

Wild Wonders of Europe / O. Haar / Litlanesfoss waterfall, Hengifossá river, basalt lava solidified in hexagonal columns, Iceland, August 2008.

Wild Wonders of Europe / O. Haarberg / Litlanesfoss waterfall, Hengifoss river, Basalt lava solidified in hexagonal columns, Iceland, August 2008 - EMBARGOED UNTIL AUGUST 2012

Nick Garbutt / Gulik Falls, edge of southern plateau, Maliau Basin, Sabah's 'Lost World', Borneo (digitally stitched image)

Mark Hamblin / 2020VISION / Stream running through wooded gorge. Abernethy NNR, Cairngorms National Park, Scotland, UK, September 2011. Did you know? Abernethy Forest is the largest remnant of the Ancient Caledonian Forest in...

Mark Hamblin / 2020VISION / River Tromie flowing through gorge in autumn woodland. Cairngorms National Park, Scotland, UK, March.

Fergus Gill / 2020VISION / Dipper (Cinclus cinclus) on rock in stream. Perthshire, Scotland, May.

Ben Lascelles / Iguazu waterfalls, Iguacu National Park, Argentina. October 2008.

Erlend Haarberg / Small waterfall near Mount Kirkjufell with aurora borealis in the night sky, Snaefellsnes, Iceland, September 2010

Erlend Haarberg / Tourists admiring Dettifoss waterfall, Jokulsargljafur National Park, Iceland, July 2008. No release available.

Rob Jordan / 2020VISION / Tributary of the River Tweed where Brown trout (Salmo trutta) and Atlantic salmon (Salmo salar) come to spawn, Cheviot Hills, Northumberland, England, UK, October

Laurie Campbell / Two Atlantic salmon (Salmo salar) acending waterfall to reach spawning beds, Perthshire, Scotland, November

Graham Eaton / A low angle view of a waterfall, from within a mountain stream, Ogwen Cottage, Snowdonia NP, Gwynedd, Wales, UK, February

Graham Eaton / View looking up a waterfall from within a stream, Snowdonia NP, Gwynedd Wales, UK, December

Graham Eaton / A split-level view through a small waterfall, Llanberis, Snowdonia NP, Gwynedd, Wales, UK, July

Ben Hall / 2020VISION / Stock Ghyll waterfall in autumn, Lake District NP, Cumbria, England, UK, November

Ben Hall / 2020VISION / Grey heron (Ardea cinerea) standing on rock at the base of a waterfall, Lake District NP, Cumbria, England, UK, November

Ben Hall / 2020VISION / Stock Ghyll waterfall in autumn, with motion blur from wind, Lake District NP, Cumbria, England, UK, November

Inaki Relanzon / Tiny creeper (Globularia repens) growing on rock with Gavarnie Falls in the background, Pyrenees, France, June 2011.

Luis Quinta / Waterfall in Laurisilva Forest, Madeira Island, April 2009.

Luis Quinta / Schreiber's lizard (Lacerta schreiberi) adult male on river bank with waterfall in background, Geres National Park, Portugal, May.

Juan Carlos Munoz / Jersey tiger moth (Euplagia quadripunctaria) large numbers flying to and resting on Sweetgum trees (Liquidambar orientalis) in the Petaloudes Valley, Rhodes island, Greece, August 2011

Andy Rouse / Waterfall and ice cliff catching evening light. Austfonna Polar Ice Cap, Svalbard, Norway, August 2011.

Andy Rouse / Waterfall from ice cliffs with ice-cap stretching into the distance. Austfonna Polar Ice Cap, Svalbard, Norway, August 2011.

Andy Rouse / Ice cliff and waterfall catching evening light. Austfonna Polar Ice Cap, Svalbard, Norway, August 2011.

Andy Rouse / Waterfall from ice cliffs with ice-cap stretching into the distance. Austfonna Polar Ice Cap, Svalbard, Norway, August 2011.

Michael Hutchinson / Rainbow in spray of Seljalandsfoss waterfall, Iceland

Andy Rouse / 2020VISION / European river otter (Lutra lutra) climbing to the top of a weir, river, Dorset, UK, November

Nick Garbutt / Maliau Falls (6th of 7 tiers) on the Maliau River with a brooding storm in the sky. Centre of Maliau Basin, Sabah's 'Lost World', Borneo.

Nick Garbutt / Takob-Akob Falls, Maliau Basin, Sabah's 'Lost World', Borneo.

Inaki Relanzon / Springs and waterfalls of Yaga River, in the Escuain Canyon and Valley. Ordesa National Park, Pyrenees, Spain, June 2011.

Ben Hall / Dipper (Cinclus cinclus) perched on moss-covered waterfall, Peak District NP, Derbyshire, UK, May, Highly Commended, Habitat category, British Wildlife Phototgraphy Awards (BWPA) competition 2011

Robert Thompson / A cascade of waterfalls falling over a cliff in woodlands. Plitvice National Park, Croatia, May 2010.

Diane McAllister / The snow at Horsetail Falls' begins to melt in mid-February, enabling the falls to resume once again. The clear sky and low sun angle ignite the rock wall during sundown. Yosemite National Park, Calif...

Matthew Maran / Waterfall on the the Darling River with a fallen tree as a bridge over the waters. West Coast Trail, Pacific Rim National Park Reserve, west coast of Vancouver Island, Canada, September 2010.

Alex Hyde / The Fairy Pools, on the Allt Coir' a' Mhadaidh river running down from the Cullin Hills, Glen Brittle, Isle of Skye, Inner Hebrides, Scotland, UK, February 2010.

Alex Hyde / The Fairy Pools, on the Allt Coir' a' Mhadaidh river running down from the Cullin Hills, Glen Brittle, Isle of Skye, Inner Hebrides, Scotland, UK, February 2010.

Orsolya Haarberg / Hraunfossar waterfall in autumn. Iceland.

Orsolya Haarberg / Dying Northern fulmar (Fulmarus glacialis) on the dark bottom of a deep gorge, Saefellsnes peninsula, Iceland, September 2010

Marie Read / Taughannock Falls, near Ithaca, New York, in autumn after a day of heavy rainfall. October 2010. At 215 feet, Taughannock Falls is 33 feet taller than Niagara Falls.

Merryn Thomas / Kilt Rock and Loch Mealt waterfall under stormy skies in the morning, bassalt columns visible. Trotternish Peninsula, Isle of Skye, Scotland. September 2010.

Floris van Breugel / View from behind one of the many waterfalls in Watkins Glen, upstate New York's fingerlakes region. New York, USA. May 2008

Alex Hyde / Madagascar reed frog {Heterixalus madagascariensis} in front of waterfall, montane rainforest. Andasibe-Mantadia NP, Eastern Madagascar.

Guy Edwardes / Two people silhouetted in front of Skogafoss waterfall in southern Iceland, June 2009

Guy Edwardes / Svartifoss / Black Falls, Skaftafell National Park Iceland, July 2009

Guy Edwardes / Seljalandsfoss falls, Southern Iceland, June 2009

Andy Rouse / Dipper (Cinclus cinclus) emerging from nest on waterfall, Brecon Beacons National Park, Wales, UK

Michel Roggo / Lake trout (Salmo trutta lacustris) morph of Brown Trout, jumping up waterfall on migration to spawning ground, Lac de Neuchtel, Switzerland 2006

Michel Roggo / European grayling (Thymallus thymallus) under waterfall waiting for drift food, Sava river, Slovenia, 2003

Jouan & Rius / Cascade flowing in Hancock gorge, Karijini National Park, Pilbara, Western Australia. August 2009

Tim Laman / A waterfall in the lowland rainforest of Borneo, with pool surrounded by ferns and other plants. Lambir Hills National Park, Sarawak, Malaysia.

Tim Laman / A waterfall in the lowland rainforest of Borneo, with pool surrounded by ferns and other plants. Lambir Hills National Park, Sarawak, Malaysia.

Aflo / N-14708 Waterfall falling onto mossy stones, Nagano, Japan.

Aflo / N-13802 River and waterfall in woodland, Aomori, Japan.

Aflo / N-13804 River and waterfall in woodland, Aomori, Japan.

Aflo / N-14103 River flowing through temperate rainforest, Olympic NP, Washington, USA

Aflo / N-14405 Double waterfall in woodland, Tochigi, Japan.

Stephen Dalton / Water splashing over a rock, backlit, UK

Thomas Lazar / Sunlight creating a rainbow in the spray of the Bridalveil Falls, Yosemite National Park, California, USA, June 2008

Inaki Relanzon / Bujaruelo Valley with stream and waterfall and snow above the tree line; mixed deciduous and coniferous forest, Ordesa and Monte Perdido National Park, Pyrenees, Spain. October 2009

Inaki Relanzon / Waterfall at Bujaruelo Valley, Ordesa and Monte Perdido National Park, Pyrenees, Spain. October 2009

Nick Upton / Alpine / Yellow-billed chough (Pyrrhocorax graculus) flying past waterfall and sheer cliffs of the Cirque de Gavarnie, Haute Pyrenees, France.

Wild Wonders of Europe / O. Haarberg / Rainbow in Hengifoss waterfall flowing over layers of grey basalt and reddish sandy clay, Iceland, August 2008

Wild Wonders of Europe / Biancar / Veliki Prstavci waterfalls close to Gradinsko lake at dawn, Upper Lakes, Plitvice Lakes NP, Croatia, October 2008. Highly commended in GDT European Nature Photographer of the Year competition 2010.

Inaki Relanzon / Alpine rose (Rhododendron ferrugineum) with waterfall in the background, La Cerdagna, Pyrenees, Catalonia, Spain. June 2006

Wild Wonders of Europe / della Ferrera / Black maidenhair fern (Adiantum capillus veneris) with water falling past, near Kravice falls, Trebizat River, Bosnia and Herzegovina, May 2009

Wild Wonders of Europe / della Ferrera / Kravice falls along the Trebizat River, Bosnia and Herzegovina, May 2009

Laurie Campbell / Flash flood, Kinloch Rannoch, Perthshire, Scotland, UK, June

Laurie Campbell / Male Atlantic salmon {Salmo salar} leaping, migrating upstream to spawn, Perthshire, Scotland, UK, October

Juan Manuel Borrero / Waterfall in St. Miguel de Fay Sanctuary, Barcelona, Catalonia, Spain. May 2008.

Wild Wonders of Europe / Zupanc / Savica waterfall (Slap Savica) Triglav National Park, Slovenia, August 2009

Wild Wonders of Europe / Zupanc / Savica waterfall (Slap Savica) Triglav National Park, Slovenia, August 2009

Wild Wonders of Europe / Radisics / Waterfall near Sao Vicente, Madeira, March 2009

Wild Wonders of Europe / Radisics / Waterfall near Sao Vicente, Madeira, March 2009

Wild Wonders of Europe / Radisics / Waterfall near Sao Vicente, Madeira, March 2009

Wild Wonders of Europe / Radisics / Water falling over basalt stones, Paul de Serra mountains, Madeira, March 2009

Wild Wonders of Europe / Zupanc / River Soca flowing through Velika korita with waterfalls, Triglav National Park, Slovenia, June 2009

Wild Wonders of Europe / Zupanc / Waterfalls on the River Lepenjica, Triglav National Park, Slovenia, June 2009

Wild Wonders of Europe / Zupanc / River Lepenjica cascading over rocks, Triglav National Park, Slovenia, July 2009

Wild Wonders of Europe / Zupanc / River Zadnjica, cascading past moss covered stones, Triglav National Park, Slovenia, July 2009

Wild Wonders of Europe / Zupanc / River Tolminka flowing over rocks, Tolminka canyon, Triglav National Park, Slovenia, October 2008