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In geography, a confluence is the meeting of two or more bodies of water. Known also as a conflux, it refers either to the point where a tributary joins a larger river, called the main stem,…

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What a sight!

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In geography, a confluence is the meeting of two or more bodies of water. Sometimes, these places can be very unusual... The confluences below were selected for their dramatic visual contrast - you can see the boundaries, where the two (or three) differently colored rivers mix to form one larger river. 1. Confluence of the Rhone and Arve Rivers, Switzerland The river on the left is the Rhone, and the river on the right is the Arve [link] This is a place of confluence of the rivers Rhona and Arve in Geneva, Switzerland. Here is the Rhona in the left part of the picture (the river has its source from Lake Leman). And in the right part there is the Arve flowing from many glaciers in the Chamonix Valley, and then the river flows to the north-west, flowing into the Rhona at the eastern part of Geneva. link The Arve has higher level of silt in its water than the Rhona has, and that is why we can see clearly the boundary between them. [link, map] 2. Confluence of the Danube, Inn and Ilz Rivers, Germany Aerial View of Passau and the Confluence of the Inn (left), Danube (right) and the Ilz river (small river far right) link Passau is a town in Lower Bavaria, Germany. It is known as the Dreiflüssestadt or "City of Three Rivers," because the Danube is joined at Passau by the Inn from the south and the Ilz from the north. link The Ilz is a relatively small mountain stream and has a blue-ish color, while the Inn is a fairly large river flowing in from Salzburg, Austria at the top. The Inn River has more water flow than the Danube, yet flowing away from the city the three combined rivers are called Danube. This photo is taken from the fortress (now a city museum) on top of the Ilzstadt cliff above the city. [link1, link2, map] 3. Confluence of the Alaknanda and Bhagirathi Rivers, India Bhagirathi on the left & Alaknanda on the right side link This is a place of junction of the rivers Alaknanda and Bhagirathi in Devprayag, India. Devprayag is a town in the state of Uttarakhand, India. This is one of the five places of the river Alaknanda junctions, and the place, where the river Ganges is “born” (these two rivers form the Ganges). link The Alaknanda has its source from the bottom of Bhagirath Kharak and Satopanth Glaciers. The river Bhagirathi flows out of Gangotri Glacier. The Alaknanda contributes a significantly larger portion to the flow of the Ganges than the Bhagirathi. [link, map] 4. Confluence of the Mosel and Rhine Rivers, Germany Mosel is darker and flows into the Rhine river. [link, via] In this picture we can see confluence of the Mosel and Rhine Rivers in Koblenz, Germany. Mosel is darker and flows into the Rhine river. The name of the city - Koblenz - in Latin means "confluence". link From the Ehrenbreitstein Fortress (118 meters above the Rhine) visitors have a spectacular view over the confluence of the Rhine and Mosel rivers. [map] 5. Confluence of the Green and Colorado Rivers, Utah, USA The Green River coming in from the right (Canyonlands National Park, Utah) link The Green River, located in the western United States, is the chief tributary of the Colorado River. It is only slightly smaller than the Colorado when the two rivers merge, but typically carries a larger load of silt. link The status of the Green River as a tributary of the Colorado River came about for mainly political reasons. In earlier nomenclature, the Colorado River began at its confluence with the Green River. Above the confluence the Colorado was called the Grand River. [link, map] 6. Confluence of the Thompson and Fraser Rivers, Canada The Thompson River coming in from the right. [link, via] The Thompson River is the largest tributary of the Fraser River, flowing through the south-central portion of British Columbia, Canada. link The Thompson River ends at Lytton where it meets the Fraser River. The contrast is striking as the clear Thompson River water joins with the muddy Fraser. [map] 7. Confluence of the Rio Negro and the Rio Solimoes, Brazil Rio Solimoes (yellow muddy) and the Rio Negro (dark brown) link The Meeting of Waters is the confluence between the Rio Negro, a river with dark (almost black coloured) water, and the sandy-coloured Amazon River or Rio Solimões, as it is known the upper section of the Amazon in Brazil. For 6 km (3.7 mi) the river's waters run side by side without mixing. It is one of the main tourist attractions of Manaus, Brazil. link This phenomenon is due to the differences in temperature, speed and water density of the two rivers. The Rio Negro flows at near 2 km per hour (1.2 mi /h) at a temperature of 28°C (82°F), while the Rio Solimões flows between 4 to 6 km per hour (2.5-3.7 mi /h) a temperature of 22°C (72°F). [link, map] 8. Confluence of the Jialing and Yangtze Rivers, China Yangtze river - left; Jialing river - right link This is the junction of the rivers Jialing and Yangtze in Chongqing, China. The river Jialing is transparent, 119 km long river, and its most notable characteristic is its sinuous course. It flows into the river Yangtze in the city of Chongqing. link The color of Yangtze river comes from the silt that is being carried downstream from the mountains and valleys it passes through. The Yangtze becomes more powerful after it absorbs the water of Jialing as it continues its path, passing through the Three Gorges and stretching thousands of miles. [map] 9. Confluence of the Rio Uruguay and a tributary, Argentina link Confluence of the Rio Uruguay and a tributary, Misiones province, Argentina. Drastically cleared to make way for farming, the tropical rainforest of Argentina is now in some areas a less effective defense against erosion than it was in the past. The heavy rains in the province of Misiones (79 inches, per year) wash the soil and carry off significant quantities of iron-rich earth into the Rio Uruguay, turning the waters a dark, reddish color. Carried by the river, this sediment is dumped in the estuary of the Rio de la Plata – the largest on Earth – and accumulates in the access channels to the port of Buenos Aires. [link] 10. Confluence of the Ohio and Mississippi Rivers, Illinois, USA Mississippi River - left; Ohio River - right link The Ohio River becomes a tributary of the Mississippi River directly south of Cairo, Illinois, a small city on the spit of land where the rivers converge. link Ohio River is usually green and Mississippi is brown colored. The distinct boundary between the two river’s waters indicates that little to no mixing occurs even 5-6 kilometers (3-4 miles) downstream. [link, map] 11. Confluence of the Drava and Danube Rivers, Croatia Drava (left) flows into the Danube (right) [link, via] Here is the place where the rivers Drava and Danube meet not far from the city of Osijek, Croatia. Osijek is situated on the right bank of the river Drava, 25 kilometers away from the place of junction of the rivers. [link, map] 12. Confluence of the Monongahela and Allegheny Rivers, Pennsylvania, USA Allegheny River (left) and Monongahela River (right) link The Allegheny River is a principal tributary of the Ohio River; it is located in the Eastern United States. The Allegheny River joins with the Monongahela River to form the Ohio River at the "Point" of Point State Park in Downtown Pittsburgh, Pennsylvania. link The Monongahela is largely a working river, supporting barge traffic up and down through industrial and mining towns in southwestern Pennsylvania and West Virginia. In contrast, the Allegheny still contains stretches of river that are designated wild and scenic. [link1, link2, map]

Explore these picturesque rivers from around the world through photographs that capture an angle you don't typically get in person.

Woodhill Park campsite is nearest to the camera and Cromer pier can be seen in the distance. North Norfolk aerial image

Bogda Mountains - The Turpan Depression, nestled at the foot of China's Bogda Mountains, is a strange mix of salt lakes and sand dunes, and is one of the few places in the world that lies below sea level. Delta Region, Netherlands - Along the southern coast of the Netherlands, sediment-laden rivers have created a massive delta of islands and waterways in the gaps between coastal dunes. Brandberg Massif - Rising unexpectedly from the heart of the Namib Desert in northern Namibia, the Brandberg Massif is an exhumed granite intrusion. Desolation Canyon - Utah's Green River flows south across the Tavaputs Plateau (top) before entering Desolation Canyon (center). Ganges River Delta - The Ganges River forms an extensive delta where it empties into the Bay of Bengal. Great Salt Desert - Like swirls of paint on an enormous canvas, shallow lakes, mudflats, and salt marshes share the sinuous valleys on Iran's largely uninhabited Dasht-e Kavir, or Great Salt Desert. Great Sandy Desert - The western region of Australia's Great Sandy Desert is in an area almost devoid of sand, but characterized by complex geology. Great Sandy Scars - In a small corner of the vast Great Sandy Desert in Western Australia, large sand dunes --the only sand in this desert of scrub and rock -- appear as lines stretching from left to right. Konari, Iran - The Mand River and the small town of Konari nestle in the Zagros Mountains in western Iran. Lake Disappointment - Surrounded by sand dunes, Lake Disappointment is an ephemeral salt lake in one of the most remote areas of Western Australia. Lena Delta - The Lena River, some 2,800 miles (4,400 km) long, is one of the largest rivers in the world. The Lena Delta Reserve is the most extensive protected wilderness area in Russia. Mississippi River Delta - Turbid waters spill out into the Gulf of Mexico where their suspended sediment is deposited to form the Mississippi River Delta. Namib Desert, Namibia - Namib-Naukluft National Park is an ecological preserve in Namibia's vast Namib Desert. Coastal winds create the tallest sand dunes in the world here, with some dunes reaching 980 feet (300 meters) in height. Niger River, Massina Mali - Coursing through parched, landlocked Mali in Western Africa, the Niger River skirts the edge of the dune-striped Sahara before turning sharply south to join the Bani River. Tides and ocean currents in the Bahamas sculpted the sand and seaweed beds into these multicolored, fluted patterns in much the same way that winds sculpted the vast sand dunes in the Sahara Desert. The Optimist, Kalahari Desert, Namibia - On the edge of the Kalahari Desert in Namibia, sand dunes are encroaching onto once-fertile lands in the north. Parana River Delta - The Parana River delta is a huge forested marshland about 20 miles northeast of Buenos Aires, Argentina. The Parana River delta is one of the world's greatest bird-watching destinations. This image highlights the striking contrast between dense forest and wetland marshes, and the deep blue ribbon of the Parana River. Syrian Desert - Between the fertile Euphrates River valley and the cultivated lands of the eastern Mediterranean coast, the Syrian Desert covers parts of modern Syria, Jordan, Saudi Arabia, and Iraq. Ugab River - Elusive, but ecologically vital, Namibia's Ugab River only flows above ground for a few days each year. The subterranean waters underlying this ephemeral river, however, are shallow enough in places to fill hollows and sustain a wildlife population that includes the rare desert elephant. Volga River Delta - Where the Volga River flows into the Caspian Sea, it creates an extensive delta. The Volga Delta is comprised of more than 500 channels, and sustains the most productive fishing grounds in Eurasia.

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