Cham people using a Dai fishing system for trei real fish on the Tonle Sap River, Cambodia, Indochina, Southeast Asia, Asia

Cham people using a Dai fishing system for trei real fish on the Tonle Sap River, Cambodia, Indochina, Southeast Asia, Asia

An El train on the Elevated train system crossing Wells Street Bridge, Chicago, Illinois, United States of America, North America

An El train on the Elevated train system crossing Wells Street Bridge, Chicago, Illinois, United States of America, North America

A view of a minor waterfall on the Mitchell River viewed from a helicopter, Kimberley, Western Australia, Australia, Pacific

Aerial vertical drone perspective of the Baixa district with its iconic grid system leading to the Commerce Square and Tagus River, Lisbon, Portugal, Europe

Colourful boats on the Aztec canal system, UNESCO World Heritage Site, Xochimilco, Mexico City, Mexico, North America

River boat on the Congo river, Mbandaka, Equateur province, Democratic Republic of Congo, Africa

Kasai River flowing through Tshikapa, Kasai, Democratic Republic of Congo, Africa

A view of the Mitchell River meandering towards Swift Bay as seen from a commercial helicopter, Kimberley, Western Australia, Australia, Pacific

Aerial view of the Santa Cruz River around El Calafate, Patagonia, Argentina, South America

Colourful boats on the Aztec canal system, UNESCO World Heritage Site, Xochimilco, Mexico City, Mexico, North America

Colourful boats on the Aztec canal system, UNESCO World Heritage Site, Xochimilco, Mexico City, Mexico, North America

Colourful boats on the Aztec canal system, UNESCO World Heritage Site, Xochimilco, Mexico City, Mexico, North America

An El train on the Elevated train system crossing Wells Street Bridge, Chicago, Illinois, United States of America, North America

Canoes by the Manakara River, part of the Pangalanes Canal system, Manakara, Madagascar, Indian Ocean, Africa

Campers by Lake Tinaroo, a recreation area in the Barron River hydro system on the Atherton Tableland, south west of Cairns, Queensland, Australia, Pacific

A variety of speleothems including stalactites, stalagmites, columns, straws and drapery at Ngilgi Cave, a limestone Karst cave system near Yallingup in the South West, Augusta-Margaret River Shire, Western Australia, Australia, Pacific

Restaurant along the Manakara River, part of the Pangalanes canal system, Manakara, Madagascar, Africa

Typical rice boats on the Backwaters, a canal system along the coastline, boat is also accommodation for tourists, Kerala, India

Suspension railway above the river Wupper, Wuppertal, Bergisches Land, North Rhine-Westphalia, Germany, Europe

Luxury River cruise ship MS Vrinda, Backwaters, Kerala, India

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

Typical rice boats on the Backwaters, a canal system along the coastline, Kerala, India

Typical rice boat on the Backwaters, Kerala, India

Luxury River cruise ship MS Vrinda, Backwaters, Kerala, India

Supporting system, Wuppertal Floating Tram suspended monorail, Wuppertal, Bergisches Land region, North Rhine-Westphalia, Germany, Europe

Lighthouse behind the dike on the Elbe river, Altes Oberfeuer Hollerwettern beacon at Brokdorf, Hollerwettern, Wewelsfleth, Wilstermarsch, Kreis Steinburg district, Schleswig-Holstein, Germany,

Female hiker waits for pack horses to pass on the South Kaibab Trail in Grand Canyon National Park north of Williams, Arizona May 2011. The South Kaibab Trail starts on the south rim of the Colorado Plateau and follows a ridge out to Skeleton Point allowing for 360-degree views of the canyon then down to the Colorado River. At the Colorado River the trail connects with the North Kaibab trail as part of the Arizona Trail system, that crosses the state of Arizona from Mexico to Utah.

The Trans-Alaska Pipeline Appears Through Fog Where It Crosses The Tanana River On A Subzero Morning, Alaska, United States Of America

River With Snow Covered Evergreens At Sunset, Ontario, Canada

Expressway Tunnel Ventilation System Building at dusk, USA, Massachusetts, Boston, Fort Point Channel

Drainage system with lake on the surface of the ice sheet. The brown sediment on the ice is created by the rapid melting of the ice. Landscape of the Greenland ice sheet near Kangerlussuaq. America, North America, Greenland, danish territory

Drainage system on the surface of the ice sheet. The brown sediment on the ice is created by the rapid melting of the ice. Landscape of the Greenland ice sheet near Kangerlussuaq. America, North America, Greenland, danish territory

Drainage system on the surface of the ice sheet. The brown sediment on the ice is created by the rapid melting of the ice. Landscape of the Greenland ice sheet near Kangerlussuaq. America, North America, Greenland, danish territory