Alex Mustard / 2020VISION / Kayaker on the River Etive, Highlands, Scotland, UK, April 2012. Did you know? Freshwater ecosystems have a higher density of species than either the land or the sea.

Angelo Gandolfi / Aerial view of people kayaking on the river Megalos Potamos, between the endemic Cretan palm trees (Phoenix theophrasti) Crete, Greece

Billy Black / Distant figures with kayak on Sandy Island, near Carriacou Island, the Grenadines, Caribbean, January 2010.

Gavin Hellier / Colourful sailboats on Jolly Beach, Antigua, Antigua and Barbuda, Leeward Islands, Lesser Antilles, Caribbean, West Indies, 2012

Orsolya Haarberg / Aerial view of man and woman kayaking on the sea, Husvaer, Heroy, Helgeland, Nordland, Norway, August 2008

Ernie Janes / Rock formations at Ao Phra Nang with kayaker, Andaman sea, Thailand

Toby Roxburgh / 2020VISION / Man dragging fishing kayak into the sea, Praa Sands, Cornwall, England, UK, April 2011

Bryan and Cherry Alexander / Inuit hunter Quluntanguaq Jerimiassen in kayak in the ice strewn waters of Inglefield Bredning, Northwest Greenland, 1980. 40 BELOW bookplate.

Bryan and Cherry Alexander / Inuit hunter using kayak at ice edge in winter. Northwest Greenland, 1980. 40 BELOW bookplate.

Bryan and Cherry Alexander / Eco tourist in a sea kayak paddling past a glacier near Port Lockroy, Antarctic Peninsula.

Bryan and Cherry Alexander / Eco tourist in a sea kayak paddling past a glacier near Port Lockroy. Antarctic Peninsula Editorial use only.

Bryan and Cherry Alexander / Eco tourist in a sea kayak paddling past an iceberg near Danco Island. Antarctic Peninsula

Bryan and Cherry Alexander / Eco tourist in a sea kayak paddling past an iceberg. Danco Island, Antarctica.

Terry Whittaker / 2020VISION / Carrying kayaks across Wallasea Causeway at high tide during a Kayak event to canoe around Wallasea Island organised by the RSPB and Burnham-on-Sea Yacht Club. Essex, UK, January 2011

Terry Whittaker / 2020VISION / Participants in a Kayak event to canoe around Wallasea Island organised by the RSPB and Burnham-on-Sea Yacht Club. Essex, UK, March 2011

Terry Whittaker / 2020VISION / Participants in a Kayak event to canoe around Wallasea Island organised by the RSPB and Burnham-on-Sea Yacht Club. Essex, UK, January 2011

Bryan and Cherry Alexander / Chukchi hunter dragging Baidarka (Walrus skin boat) while hunting at the floe edge. Chukotka, Siberia, Russia.

Bryan and Cherry Alexander / Chukchi hunter dragging Baidarka (Walrus skin boat) while hunting at the floe edge. Chukotka, Siberia, Russia.

Bryan and Cherry Alexander / Chukchi hunter dragging Baidarka (Walrus skin boat) while hunting at the floe edge. Chukotka, Siberia, Russia.

Bryan and Cherry Alexander / Chukchi hunter dragging Baidarka (Walrus skin boat) while hunting at the floe edge. Chukotka, Siberia, Russia

Bryan and Cherry Alexander / Inuk helping hunting companion launch kayak from floe edge. Northwest Greenland, 1986.

Jerry Monkman / Couple sea kayaking near Sheep Porcupine Island in Acadia National Park, Maine, USA, September 2009. Model released.

Jerry Monkman / Couple sea kayaking near Sheep Porcupine Island in Acadia National Park, Maine, USA, September 2009. Model released.

Jerry Monkman / Couple sea kayaking near Sheep Porcupine Island in Acadia National Park, Maine, USA, September 2009. Model released.

Jerry Monkman / Couple sea kayaking near Sheep Porcupine Island in Acadia National Park, Maine, USA, September 2009. Model released.

Wild Wonders of Europe / Popp-Hackner / Photographer, Verena Popp-Hackner, sea kayaking past the steep cliffs of Mana Island, Kornati National Park, Croatia, May 2009

Wild Wonders of Europe / Popp-Hackner / Photographer, Verena Popp-Hackner, sea kayaking past the steep cliffs of Mana Island, Kornati National Park, Croatia, May 2009

Tim Laman / Photographer Tim Laman (foreground) and field assistant Zafer Kizilkaya explore and photograph the mangroves by kayak. Kostrae Island, Federated States of Micronesia. July 2005, model released

Tim Laman / Field Assistant Zafer Kizilkaya paddling a kayak through a mangrove channel. The forested slopes of Kosrae Island are in the background. Kostrae Island, Federated States of Micronesia. June 2005. mode...

Jerry Monkman / A man taking sea kayak at dawn to sea at the Shifting Lots Preserve in Plymouth, Massachusetts, USA. Owned by the Wildlands Trust. Cape Cod Bay. Near Ellisville Harbor State Park. Model Released. May...

Jerry Monkman / Sea kayaks on the municipal pier in Bar Harbor, Maine, USA

Jerry Monkman / Fishing from sea kayaks in the mouth of the Connecticut River between Old Saybrook and Old Lyme, Connecticut, USA. Old Saybrook Lighthouse. Long Island Sound.

Pete Oxford / Sea Kayaking, Santa Cruz Island, Galapagos 2006

Pete Oxford / Sea Kayaking, Santa Cruz Island, Galapagos 2006

David Noton / Sea kayaks in Coles Bay off the Freycinet Peninsula, Freycinet National Park, east coast, Tasmania, Australia

Pete Cairns / Two sea kayaks on sea, Wester Ross, Scotland, UK.

Staffan Widstrand / Mother and child kayaking, Mja, Stockholm archipelago, Sweden.

Staffan Widstrand / Lone kayak on water - ecotourism in the Stockholm Archipelago, Sweden.

Onne van der Wal / Canoe on the roof of a VW Camper Van parked up by the sea, South Island, New Zealand.