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The Amazon Delta is a huge river delta formed by the Amazon River and the Tocantins River in northern South America. It covers the Marajó Archipelago and includes the cities of Belém and Macapá.
Oct 21, 2023 · Learn about the Amazon Delta, a region where the Amazon River meets the Atlantic Ocean, and its unique features, wildlife, and history. Discover how the delta is shaped by climate, sediments, islands, and human activities.
The Atlantic has sufficient wave and tidal energy to carry most of the Amazon's sediments out to sea, thus the Amazon does not form a true delta. The great deltas of the world are all in relatively protected bodies of water, while the Amazon empties directly into the turbulent Atlantic.
Jan 6, 2024 · Welcome to Amazon Delta, a Tropical island in the South Atlantic Ocean, part of the majestic Atlantic Ocean. This guide offers a comprehensive overview of what makes Amazon Delta unique – from its geography and climate to its population, infrastructure, and beyond.
- Formation
- Subdivisions
- Ecology
- Wildlife
- Other
- Geology
- Classification
- Etymology
- Variations
- Examples
- Significance
- Summary
- Economy
- Resources
- Management
- Issues
- Status
Deltas are wetlands that form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river. Although very uncommon, deltas can also empty into land. Tide-dominated deltas usually form in areas with a large tidal range, or area between high tide and low tide. The massive Ganges-Brahmaputra delta, in I...
A delta is sometimes divided into two parts: subaqueous and subaerial. The subaqueous part of a delta is underwater. This is the most steeply sloping part of the delta, and contains the finest silt. The newest part of the subaqueous delta, furthest from the mouth of the river, is called the prodelta.
Like most wetlands, deltas are incredibly diverse and ecologically important ecosystems. Deltas absorb runoff from both floods (from rivers) and storms (from lakes or the ocean). Deltas also filter water as it slowly makes its way through the delta's distributary network. This can reduce the impact of pollution flowing from upstream. Deltas are als...
Many, many animals are indigenous to the shallow, shifting waters of a delta. Fish, crustaceans such as oysters, birds, insects, and even apex predators such as tigers and bears can be part of a delta's ecosystem.
A river will also not form a delta if exposed to powerful waves. The Columbia River in Canada and the United States, for instance, deposits enormous amounts of sediment into the Pacific Ocean, but strong waves and currents sweep the material away as soon as it is deposited.
Tides also limit where deltas can form. The Amazon, the largest river in the world, is without a delta. The tides of the Atlantic Ocean are too strong to allow silt to create a delta on the Amazon.
There are two major ways of classifying deltas. One considers the influences that create the landform, while the other considers its shape.
The term delta comes from the upper-case Greek letter delta (Δ), which is shaped like a triangle. Deltas with this triangular or fan shape are called arcuate (arc-like) deltas. The Nile River forms an arcuate delta as it empties into the Mediterranean Sea.
Not all deltas are triangle-shaped. A bird-foot delta has few, widely spaced distributaries, making it look like a bird's foot. The Mississippi River forms a bird-foot delta as it empties into the Gulf of Mexico.
Another untraditional looking delta is the inverted delta. The distributary network of an inverted delta is inland, while a single stream reaches the ocean or other body of water. The delta of the Sacramento-San Joaquin River in northern California is an inverted delta. The rivers and creeks of the Sacramento and San Joaquin distributary networks m...
Deltas are incredibly important to the human geography of a region. They are important places for trade and commerce, for instance.
The Pearl River Delta, sometimes called the Delta of Guangdong, is another heavily urbanized river delta. The Pearl River delta is one of the fastest-growing centers of China's economy. The Pearl River delta includes both of China's two special administrative regions, the former British colony of Hong Kong and the former Portuguese colony of Macau....
Deltas have a rich accumulation of silt, so they are usually fertile agricultural areas. The world's largest delta is the GangesBrahmaputra delta in India and Bangladesh, which empties into the Bay of Bengal. Bangladesh sits almost entirely on this delta. Fish, other seafood, and crops such as rice and tea are the leading agricultural products of t...
Similarly, the inverted delta of the Sacramento and San Joaquin Rivers in northern California is one of the most agriculturally rich areas in the U.S. The soil supports crops from asparagus to zucchini, wine grapes to rice.
Extensive river management threatens deltas. River management involves monitoring and administering a river's flow (often through the use of dams). River management increases the amount of land available for agricultural or industrial development, and controls access to water for drinking, industry, and irrigation.
Engineers and government officials must consistently debate the interests of agriculture, industry, the environment, and citizen safety and health when putting delta wetlands at risk.
In the United States, dams on the Colorado River nearly prevent it from reaching its delta on the Sea of Cortez, Mexico. The ecosystem (what was once the world's largest desert estuary) has been reduced to a fraction of its former area, and many indigenous species are vulnerable, threatened, or endangered.
Sep 17, 2020 · How will sea level rise affect the Amazon Delta by 2100? Explore the interactive map and learn about the impacts of flooding, pollution and population displacement.
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Nov 21, 2022 · The delta is formed by the Amazon River and the Tocantins River (through the Pará River distributary channel) and is located in the Brazilian states of Pará and Amapá. Visit Worldview to visualize near real-time imagery from NASA's EOSDIS; check out more Worldview weekly images in our archive.
