Rabelo boats near the Dom Luis I Bridge (Luis I Bridge) over the Douro River, UNESCO World Heritage Site, Porto, Norte, Portugal, Europe

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

River rapids at the Miabi water reservoir, Mbuji Mayi, Eastern Kasai, Democratic Republic of Congo, Africa

Aerial of a dugout canoe on the Congo River, Mbandaka, Equateur province, Democratic Republic of Congo, Africa

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

Aerial of the Congo River, Mbandaka, Equateur province, 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

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

Aerial of a dugout canoe on the Congo River, Mbandaka, Equateur province, Democratic Republic of Congo, Africa

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

Australasian darter bird (Anhinga novaehollandiae) drying wings, snake bird spreading wings, Poovar Island, Kerala, India, Asia

Hippopotamuses (Hippopotamus amphibius) in the river Khwai, Okavango Delta, Botswana, Africa

Old farmer walking with cow, carrying hand carved wooden plough on his shoulder, Majuli Island, largest riverine island in the world, in the Brahmaputra River, Assam, India, Asia

Mishing tribal village house, Majuli Island, largest freshwater riverine island in the world, in the Brahmaputra River, Assam, India, Asia

Monk, Dankhinbat Hindu monastery, Majuli Island, largest freshwater riverine island in the world, in the Brahmaputra River, Assam, India, Asia

Tourists in paddle boat at entrance to Riverine Cave. longest navigable river traversed tunnel in the world, Subterranean River National Park, Sabang Town, Palawan, Philippines, Southeast Asia, Asia

Saharan desert rivers, satellite image

Alluvial Fan, China

View at bridge and riverine town, Laufenburg, High Rhine, Black Forest, Baden-Wuerttemberg, Germany, Europe

View at houses and church of riverine town of Lorch, Rheingau, Hesse, Germany, Europe