River PNG Transparent Images

Submitted by on Aug 2, 2021

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A river is a naturally flowing watercourse that flows towards an ocean, sea, lake, or another river, and is generally freshwater. A river may run into the earth and become dry at the end of its course before reaching another source of water in rare situations. Streams, creeks, brooks, rivulets, and rills are all terms used to describe small rivers.

Although in certain nations or communities, a stream is defined by its size, there are no formal definitions for the general word river as applied to geographic features. Many minor river names are regionally distinctive; for example, “run” is used in some regions of the United States, “burn” is used in Scotland and northeast England, and “beck” is used in northern England. A river is sometimes defined as being larger than a stream, although this is not necessarily the case: the terminology is ambiguous.

The hydrological cycle includes rivers. Water gathers in a river through surface runoff and other sources such as groundwater recharge, springs, and the release of stored water in natural ice and snowpacks via a drainage basin (e.g., from glaciers).

Rivers and streams are commonly thought of as important landscape features, yet they only cover around 0.1 percent of the surface on the planet. The fact that many human towns and civilizations are constructed around freshwater provided by rivers and streams makes them more apparent and significant to people. Most of the world’s largest cities are located on the banks of rivers, which are or were utilized as a supply of water, a means of transportation, a boundary, a defensive measure, a source of hydropower to run equipment, a place to bathe, and a place to dispose of garbage.

Limnology is the study of inland waterways in general, whereas potamology is the scientific study of rivers.


A river starts from a source (or multiple sources), continues a course, and eventually terminates at a mouth or mouths. A river’s water is generally contained within a channel, which is formed by a stream bed between two banks. Floodwaters overtopping the channel frequently create a broader floodplain in larger rivers. In comparison to the size of the river channel, floodplains might be rather large. The line between river channel and floodplain can be blurred, especially in metropolitan regions where a river channel’s floodplain might be heavily developed by housing and industry.

Rivers can produce canyons or gorges by flowing down mountains, across valleys (depressions), or along plains.

The word upriver (or upstream) refers to the direction away from the river’s source, or against the flow. Similarly, the phrase downriver (or downstream) refers to the direction in which the current runs toward the river’s mouth.

The phrase left bank refers to the flow direction of the left bank, whereas right bank refers to the flow direction of the right bank.

A single stream of water generally flows through a river channel, however some rivers flow as multiple interconnected streams of water, resulting in a braided river. Only a few places on the planet, such as New Zealand’s South Island, have extensive braided rivers. Peneplains and some of the bigger river deltas are also home to them. Anastamosing rivers resemble braided rivers and are quite uncommon. They contain several sinuous channels, one of which carries significant amounts of silt. River bifurcation is an uncommon occurrence in which a river splits and the resulting flows end up in different oceans. The bifurcation of the Nerodime River in Kosovo is an example.

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