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Aerial of a billabong, the backwater of a river on the floodplain of the East Alligator River near the border of Arnhemland and Kakadu National Park, Northern Territory, Australia

Partially submerged tilted Shiva temple below the ghats on the edge of the River Ganges (Ganga), Varanasi (Benares), Uttar Pradesh, India, Asia

Aerial image of mudflats at sunset, Solway Firth, border between Cumbria in England and Dumfries and Galloway in Scotland, United Kingdom, Europe

Aerial image of the River Esk flowing into Solway Firth, near Gretna Green, border between Cumbria in England and Dumfries and Galloway in Scotland, United Kingdom, Europe

Forest waterfall in Delaware Water Gap, Appalachians, border New Jersey and Pennsylvania, United States of America, North America

Epupa Falls on the Kunene River (which forms the border between Namibia and Angola), Kunene Region (formerly Kaokoland), Namibia, Africa

Epupa Falls on the Kunene River (which forms the border between Namibia and Angola), Kunene Region (formerly Kaokoland), Namibia, Africa

Kunene River which forms the border between Namibia and Angola, near Epupa Falls, Kunene Region (formerly Kaokoland), Namibia, Africa

Wetlands on the floodplain of the East Alligator River that forms the border between Arnhemland and Kakadu National Park, Northern Territory, Australia

Victoria Falls, UNESCO World Heritage Site, Zambesi River, on the border of Zambia and Zimbabwe, Africa

Iguazu Falls (Iguacu Falls) (Cataratas del Iguazu), UNESCO World Heritage Site, Argentinian side een from the Brazilian side, border of Brazil Argentina and Paraguay, South America

Victoria Falls, UNESCO World Heritage Site, Zambesi River, on the border of Zambia and Zimbabwe, Africa

Iguazu Falls (Iguacu Falls) (Cataratas del Iguazu), UNESCO World Heritage Site, viewing platform on Brazil side, border of Brazil Argentina Paraguay, South America

Iguazu Falls, Brazil side, UNESCO World Heritage Site, viewing platform for Devils Throat, border of Brazil Argentina and Paraguay, South America

Manual river crossing on the River Mark in autumn, taken from the Belgium-Holland border, Meersel Dreef, Belgium, Europe

Iguazu Falls (Iguacu Falls) (Cataratas del Iguazu), UNESCO World Heritage Site, seen from the Brazilian side, border of Brazil Argentina and Paraguay, South America

Iguazu Falls (Iguacu Falls) (Cataratas del Iguazu), UNESCO World Heritage Site, Argentinian side seen from the Brazilian side, border of Brazil Argentina and Paraguay, South America

The River Uruquay marking the border, on the left Argentina, on the right Brazil, Argentina, South America

Iguazu Falls (Iguacu Falls) (Cataratas del Iguazu), UNESCO World Heritage Site, seen from the Brazilian side, border of Brazil Argentina and Paraguay, South America

The Dalai bridge from the time of the Abbasids in Zakho on the border of Turkey, Iraq Kurdistan, Iraq, Middle East

Poppies and vineyards along the border between Luxembourg and Germany separated by the River Moselle (Mosel), Germany, Europe

Iguazu Falls (Iguacu Falls) (Cataratas del Iguazu), UNESCO World Heritage Site, Brazil side viewing platform, border of Brazil Argentina and Paraguay, South America

Hoover Dam on the Colorado River forming the border between Arizona and Nevada, United States of America, North America

Iguazu Falls (Iguacu Falls) (Cataratas del Iguazu), UNESCO World Heritage Site, seen from the Brazilian side, border of Brazil Argentina and Paraguay, South America

The River Mark in autumn, Mark Bridge (Brug) in the distance, from the Belgium-Holland border, Meersel Dreef, Belgium, Europe

Hoover Dam on the Colorado River forming the border between Arizona and Nevada, United States of America, North America

Hoover Dam on the Colorado River forming the border between Arizona and Nevada, United States of America, North America

Source of River Neste de Saux at 2400m on the French border with Spain, Hautes-Pyrenees, France, Europe

A trekker pauses for a break on the edge of a glacial stream on the way to Mera Peak, a popular trekking peak in the Khumbu Region, near Mount Everest, Nepal, Himalayas, Asia

A view of the River Tamar at Calstock, with a railway viaduct crossing it, on the Devon-Cornwall border, Cornwall, England, United Kingdom, Europe

A view of the River Tamar at Calstock, with a railway viaduct crossing it, on the Devon-Cornwall border, Cornwall, England, United Kingdom, Europe

The River Tamar at Cotehele Quay, the border between Devon and Cornwall, near Gunnislake, Cornwall, England, United Kingdom, Europe

The River Zambezi crashes over the Victoria Falls waterfall (Mosi-oa-Tunya), UNESCO World Heritage Site, on the border of Zimbabwe and Zambia, Africa

The River Zambezi crashes over the Victoria Falls waterfall (Mosi-oa-Tunya), UNESCO World Heritage Site, on the border of Zimbabwe and Zambia, Africa

Paddle boarder on the River Wye at Symonds Yat, border of Herefordshire and Gloucestershire, England, United Kingdom, Europe

Cable car at the Rio Verde waterfall in the valley of the Pastaza River that flows from the Andes to the upper Amazon Basin, near Banos, Ambato Province, Central Highlands, Ecuador, South America

View of The American and Bridal Veil Falls, Niagara Falls, Niagara, border of New York State, United States of America, and Ontario, Canada, North America

View of Horseshoe Falls, Niagara Falls, Niagara, border of New York State, and Ontario, Canada, North America

Aerial view of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

Aerial view of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

Photographer Skip Brown surfs his kayak on a whitewater wave on the Potomac River, border of Virginia and Maryland, United States of America, North America

Ian Brown stand up paddle surfs challenging whitewater below Great Falls of the Potomac River, border of Maryland and Virginia, United States of America, North America

View of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

View of the bridge over Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

View of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

Ian Brown stand up paddle surfs challenging whitewater below Great Falls of the Potomac River, border of Maryland and Virginia, United States of America, North America

Victoria Falls, UNESCO World Heritage Site, Zambesi River, on the border of Zambia and Zimbabwe, Africa

Ian Brown stand up paddle surfs challenging whitewater below Great Falls of the Potomac River, border of Maryland and Virginia, United States of America, North America

A railway viaduct across the River Tamar, at Calstock, on the Devon-Cornwall border, in east Cornwall, England, United Kingdom, Europe

View of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

Photographer Skip Brown stand up paddle surfs challenging whitewater below Great Falls of the Potomac River, border of Maryland and Virginia, United States of America, North America

Aerial view of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

View of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

View of Horseshoe Falls, Niagara Falls, Niagara, border of New York State, and Ontario, Canada, North America

Photographer Skip Brown surfs his kayak on a whitewater wave on the Potomac River on the border of Virginia and Maryland, United States of America, North America

View of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

Aerial view of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

View of The American and Bridal Veil Falls, Niagara Falls, Niagara, border of New York State, and Ontario, Canada, North America

View of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

Victoria Falls, UNESCO World Heritage Site, Zambesi River, on the border of Zambia and Zimbabwe, Africa

View of Table Rock visitor center and Horseshoe Falls, Niagara Falls, Niagara, border of New York State, and Ontario, Canada, North America

Photographer Skip Brown stand up paddle surfs challenging whitewater below Great Falls of the Potomac River, border of Virginia and Maryland, United States of America, North America

Ian Brown stand up paddle surfs challenging whitewater below Great Falls of the Potomac River, border of Virginia and Maryland, United States of America, North America

Ian Brown stand up paddle surfs challenging whitewater below Great Falls of the Potomac River, border of Maryland and Virginia, United States of America, North America

View of Old Border Bridge over the River Tweed, Berwick-upon-Tweed, Northumberland, England, United Kingdom, Europe

View of Rainbow Bridge and The American Falls, Niagara Falls, Niagara, border of New York State, and Ontario Canada, North America

Aerial view of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

View of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

View of the American Falls, Niagara Falls, Niagara, border of New York State, United States of America, and Ontario, Canada, North America

Photographer Skip Brown stand up paddle surfs in winter challenging whitewater below Great Falls of the Potomac River, border of Virginia and Maryland, United States of America, North America

Iguazu Falls from Argentinian side, UNESCO World Heritage Site, on border of Argentina and Brazil, Argentina, South America

View of Horseshoe Falls, Niagara Falls, Niagara, border of New York State, and Ontario, Canada, North America

Bridge over River Wye, Border crossing of Gloucestershire, England and Monmouthshire, Chepstow, Monmouthshire, Wales, United Kingdom, Europe

Horseshoe Falls, Niagara Falls, Niagara, border of New York State, and Ontario, Canada, North America

Horseshoe Falls, Niagara Falls, Niagara, border of New York State, and Ontario, Canada, North America

View of Horseshoe Falls, Niagara Falls, Niagara, border of New York State, and Ontario, Canada, North America

Horseshoe Falls, Niagara Falls, Niagara, border of New York State, and Ontario, Canada, North America