Nick Garbutt / North American bobcat (Lynx rufus) striding through deep snow. Madison River Valley, Yellowstone National Park, Wyoming, USA. January

LYNN M. STONE / Bullfrog (Rana catesbeiana) with head sticking out above water in pond, Deep River, Connecticut, USA, July

Jose B. Ruiz / Fig leaf in water from the Ro Tinto, or Red River, very acidic and coloured deep red by iron dissolved in the water that drains from the local Riotinto mines causing severe environmental problems. Hue...

Jose B. Ruiz / Ro Tinto, or Red River, very acidic and coloured deep red by iron dissolved in the water that drains from the local Riotinto mines causing severe environmental problems. Huelva, Spain .

Jose B. Ruiz / Dead Libellula dragonfly in the Rio Tinto, or Red River, very acidic and coloured deep red by iron dissolved in the water, causing severe environmental problems. Huelva, Spain

Suzi Eszterhas / Blue-eared kingfisher (Alcedo meninting) Sabah, Malaysia

Nick Garbutt / Coyotes (Canis latrans) and Bison (Bison bison) in deep snow. Madison River Valley, Yellowstone National Park, Wyoming, USA.

Nick Garbutt / Coyote (Canis latrans) pounce hunting for rodents in deep snow. Madison River Valley, Yellowstone National Park, Wyoming, USA.

Magnus Lundgren / Wild Wonders of China / River in Ha Pak Nai wetlands, Yuen Long District facing Deep Bay, New territories, Hong Kong, China.

Graham Eaton / River Wharfe running through The Stid, a narrow, deep cleft in rock, Bolton Abbey, Yorkshire, England, UK, November 2016.

Nick Garbutt / North American Bobcat (Lynx rufus) stalking through deep snow. Madison River Valley, Yellowstone National Park, Wyoming, USA. January

Nick Garbutt / North American bobcat (Lynx rufus) walking through deep snow. Madison River Valley, Yellowstone National Park, Wyoming, USA. January

Kirkendall-Spring / Deep Lake and East Temple Peak, Bridger Wilderness, Wind River Range, Bridger National Forest, Wyoming, USA. September 2015.

Erlend Haarberg / Woman photographing the Sarvesjakka river in a deep canyon, Sarvesvagge Valley, Sarek National Park, World Heritage Laponia, Swedish Lapland, Sweden, August 2013.

Cheryl-Samantha Owen / Farmer Willem van Wyk and his dog, looking out over Oorlogskloof canyon. Deep within the gorge is one of two known breeding sites for the Endangered Clanwilliam sandfish (Labeo seeberi). Papkuilsfonte...

Hougaard Malan / Rio de las Vueltas, deep river gorge below the mountains of El Chalten, Patagonia, Argentina. April 2013. Non-ex.

Hougaard Malan / Stormy conditions over a deep canyon. Fish River Canyon, Namibia. March 2012. Non-ex.

Hougaard Malan / Light illuminating mist in a deep canyon. Blyde River Canyon, Mpumalanga, South Africa. January 2011. Non-ex.

Lou Coetzer / African elephants (Loxodonta africana) bull feeding in deep flood waters, Chobe River, Botswana, April, Vulnerable species.

Enrique Lopez-Tapia / Children drinking water in a deep well dug into the dry bed of a river. Kaokoland, Namibia.

Enrique Lopez-Tapia / Himba boy coming out of a deep hole dug into a dry river bed to access water, Kaokoland, Namibia, September 2013.

Konstantin Mikhailov / River Kucherla with a local man on a horse crossing the montane Altai river, running at the bottom of deep gorge through the riparian forest with Siberian spruce (Picea obovata) and Siberian fir (Abie...

Rob Jordan / 2020VISION / Fisherman standing waist deep and casting in the River Teviot, near Kelso, Roxburghshire, Scotland, UK, October 2011

LYNN M. STONE / Fragrant white water lily (Nymphaea odorata) flower, Deep River, Connecticut, USA, July

LYNN M. STONE / Blue dasher dragonfly (Pachydiplax longipennis) resting near Fragrant white water lily (Nymphaea odorata) flower, Deep River, Connecticut, USA, July

LYNN M. STONE / Fragrant white water lily (Nymphaea odorata) flowering, Deep River, Connecticut, USA, July

Andy Rouse / European Otter (Lutra Lutra) in deep snow, UK, captive

Andy Rouse / European Otter (Lutra Lutra) in deep snow, UK, captive

Juan Carlos Munoz / Athabasca river flowing through deep canyon, Jasper, Rocky Mountains NP, Alberta, Canada

Theo Allofs / River flowing through deep valley near El Chalten, Argentina

Jose B. Ruiz / Río Tinto, or Red River, very acidic and coloured deep red by iron dissolved in the water that drains from the local Riotinto mines causing severe environmental problems. Huelva, Spain .

Jose B. Ruiz / Río Tinto, or Red River, very acidic and coloured deep red by iron dissolved in the water that drains from the local Riotinto mines causing severe environmental problems. Huelva, Spain

Jose B. Ruiz / Leaf in water from the Río Tinto, or Red River, very acidic and coloured deep red by iron dissolved in the water that drains from the local Riotinto mines causing severe environmental problems. Huelv...

David Kjaer / Road leading into Abergwesyn Common, National Trust. A grass and heather covered plateau, dissected by a deep river valley. Powys, Wales

David Kjaer / Road leading into Abergwesyn Common, National Trust. A grass and heather covered plateau, dissected by a deep river valley. Powys, Wales

David Kjaer / Abergwesyn Common, National Trust. A grass and heather covered plateau, dissected by a deep river valley. Powys, Wales

David Kjaer / Abergwesyn Common, National Trust. A grass and heather covered plateau, dissected by a deep river valley. Powys, Wales

Norbert Wu / European Eel (Anguilla anguilla) live very deep in the Sargasso Sea and return to rivers as adults

Sergey Gorshkov / River in deep canyon in plateau, Putoransky State Nature Reserve, Putorana Plateau, Siberia, Russia

Etienne Littlefair / Short-beaked echidna (Tachyglossus aculeatus) exploring the base of a deep sandstone gorge at night, Adelaide River Hills, Northern Territory, Australia.

Jabruson Motion / Pan up from deep tyre marks in mud to hardwood rainforest timber stockpile. The hardwood trees are transported here via the Congo River, and are then stripped and numbered for shipment and export, 'La...

SCOTLAND: The Big Picture / Abhainn Droma River running through narrow Corrieshalloch Gorge, the steep gorge walls covered in lush vegetation, Corrieshalloch Gorge Nature Reserve, Scotland, UK. May, 2021.

Etienne Littlefair / Northern snapping turtle (Elseya dentata) walking along the bottom of a deep, sandy creek, Daly region, Northern Territory,July

Etienne Littlefair / Northern snapping turtle (Elseya dentata) walking along the bottom of a deep, rocky creek, Katherine region, Northern Territory, June

Etienne Littlefair / Northern snapping turtles (Elseya dentata), small adult at rest amongst woody debris at the bottom of a deep creek bed in the Daly region, Northern Territory, Australia. June. Cropped.

Etienne Littlefair / White-throated snapping turtle (Elseya albagula), large adult female with cataracts, found active, walking along the bottom of a deep pool in the upstream of the Mary River, Queensland, Australia. Aug...

Etienne Littlefair / Broad-shelled turtle (Chelodina expansa), adult actively moving along deep river bed, possibly foraging, Mary River, Queensland, Australia. July. Cropped.

Etienne Littlefair / Mary river turtle (Elusor macrurus), full-sized adult male walking along deep riverbed, Mary River, Queensland, Australia. August. Cropped.

Etienne Littlefair / Gulf snapping turtle (Elseya lavarackorum), large adult female found active in deep water on a very hot summer night, Lawn Hill Creek, Queensland, Australia. January. Cropped.

Etienne Littlefair / Irwin's turtle (Elseya irwini), large adult female found actively moving around in a deep pool of the North Johnstone River, downstream of Malanda, Far North Queensland, Australia. August. Cropped...

Robert Pickett / Europe's largest canyon Gorges du Verdon, 700m deep in places with the emerald green River Verdon, and limestone cliffs, Parc Naturel Regional du Verdon, Provence, France.