He accompanied them on their return, by way of the Casiquiare canal, and afterwards retraced his route to the Orinoco.

During a 1924 – 25 expedition, Alexander H. Rice, Jr. of Harvard University traveled up the Orinoco, traversed the Casiquiare canal, and descended the Rio Negro to the Amazon at Manaus.

The Casiquiare is not a sluggish canal on a flat tableland, but a great, rapid river which, if its upper waters had not found contact with the Orinoco, perhaps by cutting back, would belong entirely to the Negro branch of the Amazon.

The Casiquiare canal – Orinoco River hydrographic divide is a representation of the hydrographic water divide that delineates the separation between the Orinoco Basin and the Amazon Basin.

This named outflow is the Casiquiare canal, which, as it heads downstream ( southerly ), picks up speed and also accumulates water volume.

The simplest description ( besides the entire area-floodplain ) of the water divide is a " south-bank Orinoco River strip " at the exit point of the Orinoco, also the origin of the Casiquiare canal.

* The Casiquiare canal, a river forming a natural canal between the Amazon River and Orinoco River basins, is first encountered by Europeans.

This trip, which lasted four months and covered of wild and largely uninhabited country, had the important result of establishing the existence of the Casiquiare canal ( a communication between the water-systems of the rivers Orinoco and Amazon ), and of determining the exact position of the bifurcation, as well as documenting the life of several native tribes such as the Maipures and their extinct rivals the Atures ( several words of the latter tribe were transferred to Humboldt by one parrot ).

A peculiarity of the Orinoco river system is the Casiquiare canal, which starts as an arm of the Orinoco, and finds its way to the Rio Negro, a tributary of the Amazon, thus forming a ' natural canal ' between Orinoco and Amazon.

* Casiquiare canal: in SE Venezuela, a distributary from the Orinoco flowing west to the Negro River, a major affluent to the Amazon

Only the first two subdivisions actually touch the Amazon River ; the Peruvian state is actually along the Marañón River, one of two sources of the Amazon, and the Venezuelan state is along the Casiquiare canal, a link between the Amazon ( via the Guainía River ) and the Orinoco River.

It has its sources along the watershed between the Orinoco and the Amazon basins, and also connects with the Orinoco by way of the Casiquiare canal in southern Venezuela.

# REDIRECT Casiquiare canal

This included the first descriptions by a European of the Casiquiare canal and the curare arrow poison prepared by the Amerindians.

* The Casiquiare canal, a river forming a natural canal between the Amazon River and Orinoco River basins, is first encountered by Europeans

The Neblina uakari is found north of the Rio Negro, west of the Rio Marauiá and east of the Casiquiare canal.

Acuña was the first European to describe the Casiquiare canal, a natural canal linking the Amazon and Orinoco Rivers, in 1639.

200 km to the south is one of the natural world's great wonders, the Casiquiare canal, a waterway that links South America's two greatest river systems, the Amazon and the Orinoco.

The city is located a few kilometers from the mouth of the Casiquiare canal, an important fluvial artery that connects the Amazon Basin with the Orinoco River, thus uniting Venezuela, Colombia and Brazil, and is above sea level.

It is located on the shore of the Orinoco river, only 9 miles from the Casiquiare canal bifurcation that links it to the Amazon River.

The Casiquiare river is a distributary of the upper Orinoco flowing southward into the Rio Negro, in Venezuela, South America.

The distribution of Camu camu extends from the center of Pará state, Brazil, along the mid and upper Amazon River to the eastern part of Peru ; in the north it appears in the Casiquiare and the upper and middle Orinoco River.

The origin of the Casiquiare, at the River Orinoco, is below the mission of La Esmeralda at, and about above sea level.

The volume of water the Casiquiare captures from the Orinoco is small in comparison to what it accumulates in its course.

To the west of the Casiquiare, there is a much shorter and easier portage between the Orinoco and Amazon basins, called the isthmus of Pimichin, which is reached by ascending the Terni branch of the Atabapo River, an affluent of the Orinoco.

* The point where the Casiquiare bifurcates from the Orinoco, on Google Maps

Downstream from its headwaters, it splits into two ; one-third of its flow passes through the Brazo Casiquiare ( Casiquiare Channel ) into a tributary of the Amazon, and the remainder passes into the main Orinoco channel.

They are also found in the Atabapo River and Inirida River floodplain, down the Casiquiare and Guainía floodplain where the Rio Negro is born, before entering Brazilian territory.

The water in the Casiquiare flows from the Orinoco River into the Rio Negro, tributary of the Amazon, though much more is gathered en route from numerous tributaries.

This is not a functional reference but spam :"* Alexander von Humboldt and the Casiquiare River "

There is only one small road that connect the city to the small fluvial port in the nearby town of Solano, located on the banks of the Casiquiare.

In 1968 the Casiquiare was navigated by an SRN6 hovercraft during a National Geographic expedition.

* Wikimapia satellite image displaying locations of both the beginning ( principio ) and the end ( desague ) of the Casiquiare Canal.

Just upstream of the town of Commercy, the Canal de la Meuse connects with the Canal de la Marne au Rhin by means of a short diversion canal.

The Nieuwe Waterweg (" New Waterway ") is a ship canal in the Netherlands from het Scheur ( a branch of the Rhine-Meuse-Scheldt delta ) west of the town of Maassluis to the North Sea at Hook of Holland: the Maasmond, where the Nieuwe Waterweg connects to the Maasgeul.

The spillway connects to a diversionary canal subtending a loop of the Po.

The Panama Canal () is an ship canal in Panama that connects the Atlantic Ocean ( via the Caribbean Sea ) to the Pacific Ocean.

* Corbulo orders the construction of the canal Fossa Corbulonis, between the Rhine and Meuse in the Netherlands, which connects the city Forum Hadriani ( Voorburg ).

* 1380 BC: Amenhotep III connects the Nile and the Red Sea with a canal.

The tentacular system connects the tentacles at the tip of the introvert to a ring canal at their base, from which a contractile vessel that runs along the esophagus and ends blindly posteriorly.

Three miles ( 5 km ) from Hatton Top Lock the canal passes through Shrewley Tunnel, with its separate horse tunnel, and then passes Rowington village to Kingswood Junction where a short spur connects with the Stratford-upon-Avon Canal.

This southernmost section of the canal runs from Hangzhou in Zhejiang, where the canal connects with the Qiantang River, to Zhenjiang in Jiangsu, where it meets the Yangtze.

Besides the natural watercourses of the rivers, and the ancient but artificial broads, there is one more recent navigation canal, the lock-less Haddiscoe Cut which connects the Rivers Yare and Waveney whilst permitting boats to by-pass Breydon Water.

Near Limerick, a short canal connects Plassey with the Abbey River, allowing boats to bypass the Curraghower Falls, a major obstacle to navigation.

Contrary to popular belief, the town does not sit on a barrier island but on a narrow peninsula which resembles a barrier island ( unless one considers a narrow man-made boat canal well inland that connects White Creek to Little Assawoman Bay ).

The Shinnecock Canal, a man-made canal located in the eastern part of the hamlet, connects the Great Peconic Bay with the Shinnecock Bay.

* Caledonian Canal, a canal in Scotland which connects the east and west coasts

The Great Ouse connects the Cam to England's canal system ( via the Middle Level Navigations and the River Nene ) and to the North Sea at King's Lynn.

The western end of the canal connects to the River Clyde at Bowling.

The Stratford-upon-Avon canal connects the Worcester and Birmingham Canal at Kings Norton to the River Avon at Stratford-upon-Avon in Warwickshire.

The canal connects to an un-navigable part of the River Severn, separated from the main channel by weirs at Maisemore and Llanthony, both of which have derelict locks associated with them.

This canal connects to Paretz, on the River Havel downstream, and was built in the 1950s to allow East German vessels to avoid the stretch of the river under the political control of West Berlin.

The Corinth Canal () is a canal that connects the Gulf of Corinth with the Saronic Gulf in the Aegean Sea.

The canal begins near Hawkesbury Village at Hawkesbury Junction, also known as Sutton Stop, where it connects with the Coventry Canal, four miles from the centre of Coventry.

The Foss Dyke, or Fossdyke, connects the River Trent at Torksey to Lincoln, the county town of Lincolnshire, and may be the oldest canal in England that is still in use.

The canal connects the Garonne River to the on the Mediterranean and along with the 193 km long Canal de Garonne forms the Canal des Deux Mers joining the Atlantic to the Mediterranean.