Warm afternoon sun at mouth of the River Otter at Budleigh Salterton, Devon, England, United Kingdom, Europe

An aerial view of a sand bar in the mouth of the River Teign, at Teignmouth, on the south Devon coast, England, United Kingdom, Europe

Mouth of the Shannon, County Clare, Munster, Republic of Ireland, Europe

Andalsnes located at the mouth of the river Rauma, on the shores of the Romsdalsfjord (Romsdal Fjord), More og Romsdal, Norway, Scandinavia, Europe

The riverside village of Polruan, in the mouth of the River Fowey, near the town of Fowey, southern Cornwall, England, United Kingdom, Europe

Aerial of the Kalbarri River in Kalbarri at the river mouth, Western Australia, Australia, Pacific

Aerial of the Kalbarri River in Kalbarri at the river mouth, Western Australia, Australia, Pacific

St. Mawes, mouth of River Fal, from St. Anthony headland, opposite Falmouth, Cornwall, England, United Kingdom, Europe

Amusement park and boats in mouth of River Clwyd, Rhyl town, Clywd, Wales, United Kingdom, Europe

The mouth of the Mossman River at Newell Beach, Daintree, Australia

Getxo, Atlantic resort at the mouth of the Bilbao River, Bilbao, Euskadi (Pais Vasco), Spain, Europe

Bridge over Storms River mouth in the Tsitsikamma National Park on the Garden Route in South Africa, Africa

The Mekong Delta River Mouth, Rach Gia City, Vietnam, Indochina, Southeast Asia, Asia

Traveller looks out over the mouth of the Mossman River at Newell Beach, Daintree, Australia

Boats beached on sand banks at low tide in the mouth of the River Clwyd, and the amusement park beyond, Rhyl, north Wales, United Kingdom, Europe

Looking south across Pearl Beach and Broken Bay towards the mouth of the Hawkesbury River and Pittwater, near Gosford, Central Coast, New South Wales, Australia, Pacific

Delta of sand at river mouth, Kvaenangen Sorfjord, north Norway, Scandinavia, Europe

Looking north from Gnarabup towards the famous surf break at the mouth of the Margaret River, Augusta-Margaret River Shire, Western Australia, Australia, Pacific

Fishing port of Le Treport at the mouth of the River Bresle, Seine Maritime, Normandy, France, Europe

Hotel de Ville (town hall) and fishing boats at mouth of the River Touques, Trouville, Calvados, Cote Fleurie, Normandy, France, Europe

American alligator with mouth open showing its teeth basking by Turner River by Tamiami Trial, the Florida Everglades, USA

Nile crocodile (crocodylus niloticus) shire river, malawi, close-up of head.

Seychelles, Praslin Island, River Mouth In The Lagoon

Seychelles, Praslin Island, River Mouth In The Lagoon, Young Local Boy Passing By

Inuit summer hunting camp at the mouth of the Serpentine river near Shishmaref, a tiny island inhabited by around 600 Inuits, between Alaska and Siberia in the Chukchi Sea, United States of America, North America

Inuit summer hunting camp at the mouth of the Serpentine river near Shishmaref, a tiny island inhabited by around 600 Inuits, between Alaska and Siberia in the Chukchi Sea, United States of America, North America

Inuit child on the tundra at the mouth of the Serpentine River near Shishmaref, a tiny island inhabited by around 600 Inuits, between Alaska and Siberia in the Chukchi sea, United States of America, North America

Inuit summer hunting camp at the mouth of the Serpentine river near Shishmaref, a tiny island inhabited by around 600 Inuits, between Alaska and Siberia in the Chukchi Sea, United States of America, North America

Dogfish (Hydrolicus pectoralis), jaw detail on preserved specimen, Amazon river basin, Amazonas, Brazil, South America

J J Weyouanna hunting Caribou on the tundra at the mouth of the Serpentine river near Shishmaref, a tiny island inhabited by around 600 Inuits, between Alaska and Siberia in the Chukchi Sea, United States of America, North America

Eurasian river otter (Lutra lutra) eating flatfish. Hebrides, Scotland

Eurasian river otter (Lutra lutra) eating fish. Hebrides, Scotland

Eurasian river otter (Lutra lutra). Hebrides, Scotland

J J Weyouanna hunting Caribou on the tundra at the mouth of the Serpentine river near Shishmaref, a tiny island inhabited by around 600 Inuits, between Alaska and Siberia in the Chukchi Sea, United States of America, North America

Aerial view of Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. Red lagoon near Boca Paila Bridge. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Aerial view of Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. Red lagoon near Boca Paila Bridge. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Salt marshes at dusk. Cerroja water mill. Santoￃﾱa, Victoria and Joyel Marshes Natural Park. Cantabria, Spain, Europe.

Salt marshes at dusk. Cerroja water mill. Santoￃﾱa, Victoria and Joyel Marshes Natural Park. Cantabria, Spain, Europe.

Aerial view of Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. Red lagoon near Boca Paila Bridge. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Aerial view of Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. Red lagoon near Boca Paila Bridge. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Northern Persian Gulf, satellite image

River Nile Delta and Suez Canal, Egypt, satellite image

Betsiboka River, Madagascar

Rivers Barito& Kahayan, Borneo, Indonesia, True Colour Satellite Image. South coast of Borneo, true colour satellite image

Yangtze River, Shanghai, China, True Colour Satellite Image. Satellite image of the river mouth of the Yangtze river

Betsiboka River, Madagascar, True Colour Satellite Image. Betsiboka river, the major river of Madagascar, goes into the Mozambique canal, close to the city of Mahajanga.

Hippopotamus

Hippopotamus

Hippopotamus

Hippopotamus

Hippopotamus

Hippopotamus

Aerial view of container port Bremerhaven, freighters being loaded by cranes, Weser Rivermouth, Bremerhaven, Bremen, Northern Germany

Estuarine crocodile, saltwater crocodile in the wild, the largest reptile, close-up, Top End, Northern Territory, Australia

Hippo with open mouth, Okavango Delta, Botswana, Africa

Aerial Photo, Delta of Rio Parana, Estuary in the Rio de la Plata, Buenos Aires, Argentina, South America

Aerial view of the construction of a wind turbine in the North Sea, Lower Saxony, Germany

Farmland on the Anatori River estuary, pastures surrounded by arm of the river and coastline, west coast of South Island, New Zealand

Estuarine crocodile, saltwater crocodile in the wild, the largest reptile, close-up, Northern Territory, Australia

Aerial view of Emden harbour with docks and wharfs, Emden, Lower Saxony, Germany

View from the mouth of the river Nahe at the Maeuseturm (Mice tower) and at the ruin of the Ehrenfels castle, Bingen, Cultural Heritage of the World: Oberes Mittelrheintal (since 2002), Mittelrhein, Rhineland-Palatinate, Germany, Europe

Grizzly with Salmon, Ursus arctos, Brooks River, Katmai Nationalpark, Alaska, USA

High tide at the river mouth near Karamea, blue hour, Kahurangi National Park, West coast, South Island, New Zealand

Aerial view of the container port Bremerhaven, Loading cranes along the pier, Lower Saxony, Northern Germany

St. Martin und St. Stephan cathedrals, Built 975-1235, Market portal, Lion, Mainz, Rhenish Hesse, Rhineland-Palatinate, Germany, Europe

Grizzly with Salmon, Ursus arctos, Brooks River, Katmai Nationalpark, Alaska, USA

Aerial view of the container port, Containers, loading cranes and ships along the quai, Bremerhaven, northern Germany

aerial photo of Bremerhaven, container port at the Weser river mouth

Mouth of Megalopotamos River, Preveli Beach, Crete, Greece

Aerial view of Emden harbour and the old town, Emden, Lower Saxony, Germany

Aerial view of the container port, Containers, loading cranes and ships along the quai, Bremerhaven, northern Germany

Aerial view of a freighter being towed into the harbour, Bremerhaven, northern Germany

Stream mouth and hills near the Pacific, Big Sur Coast, California, USA, America

Aerial photo of a wind farm along the North Sea coast, farmland and Ems estuary, Emden, Lower Saxony, northern Germany

Boats on river Erlauf, Poechlarn, Lower Austria, Austria

Boats on river Erlauf, Poechlarn, Lower Austria, Austria

Mouth of Megalopotamos River, Preveli Beach, Crete, Greece

Aerial view of the container port, Containers and loading cranes in the backlight, Bremerhaven, northern Germany

Female cyclist on bridge over river Erlauf, Danube Cycle Route Passau Vienna, Poechlarn, Wachau, Lower Austria, Austria

Aerial view, river carrying sediments, with sand banks, Pwani Region, Tanzania, Africa

Torre de Belem, built 1515, lighthouse built in the Manueline or Portuguese late Gothic style, mouth of the Tagus River, Lisbon, Portugal

Estuary and settlement, aerial photo between Madang and Goroka, Papua New Guinea, Melanesia

Bridge at the mouth of the Este River on the Elbe River, bascule bridge by the Este flood barrier, Cranz, Altes Land, Hamburg, Lower Saxony, Germany, Europe

Stone mask of a river god, Mouth of Truth, Bocca della Verita, Basilica of S. Maria in Cosmedin, Rome, Latium, Italy, Europe

Pont du Normandie, bridge at the mouth of the Seine River near Le Havre, architect Michel Virlogeux, cable-stayed bridge with the largest span in Europe of 856 m, France, Europe

Poor dwellings, wooden stilt houses, mangrove area in the estuary of the Rio Anchicaya river in the Pacific at high tide, Bajamar slum, Buenaventura, Valle del Cauca, Colombia, South America

Poor dwellings, stilt houses, mangrove area in the estuary of the Rio Anchicaya river in the Pacific, Bajamar slum, Buenaventura, Valle del Cauca, Colombia, South America

Aerial view, Deutsches Eck, German Corner, Mosel and Rhine rivers, Bundesgartenschau 2011, Federal Garden Show 2011, "Koblenz verwandelt", German for "Koblenz transforms", April to October 2011, Koblenz, Rhineland-Palatine, Germany, Europe

Fence in the floodplains of Neufelder Koog, polder, Elbe estuary, North Sea coast, Schleswig-Holstein Wadden Sea National Park, Dithmarschen region, Schleswig-Holstein, Germany, Europe

Hippopotamus (Hippopotamus amphibius) with mouth wide open, Masai Mara National Reserve, Kenya, Africa

Historic centre of Passau, Veste Upper House, confluence of the three rivers Danube, Inn and Ilz, Passau, Lower Bavaria, Bavaria, Germany, Europe

Hippo (Hippopotamus amphibius), grazing in shallow water, open mouth, Moremi Wildlife Reserve, Ngamiland, Botswana, Africa

Natural course of the Zellerache river from the Irrsee, wet meadow, from above, drone photo, aerial view, Mondseeland, Salzkammergut, Upper Austria, Austria, Europe

African wild dog (Lycaon pictus), resting, Moremi Game Reserve West, Okavango Delta, Botswana, Africa

Lonely volleyball net on Amoreira beach, Aljezur river estuary, estuary lagoon system, Arrifana fishing port, dunes, Atlantic coast, Amoreira, Aljezur, Portugal, Iberian Peninsula, Europe

African wild dog (Lycaon pictus), alert, Moremi Game Reserve West, Okavango Delta, Botswana, Africa

Lion (Panthera leo), Lioness, Moremi Game Reserve West, Okavango Delta, Botswana, Africa

African fish eagle (Haliaeetus vocifer), juvenile, on branch, view to re Moremi Game Reserve East, Okavango Delta, Botswana, Africa

Estuary of the Aber Benoit into the Atlantic, beach Plage de Beniguet, hydrangeas, Saint-Pabu, Communaute de communes du Pays des Abers, department of Finistere Penn-ar-Bed, region of Brittany Breizh, France, Europe

Firework above the fortress Ehrenbreitstein in Koblenz and above the german Corner with the statue of emperor Wilhelm II. Koblenz, Rhineland-Palatinate, Germany