When a river meets the sea or ocean, it often forms a unique geographical feature known as a delta. Deltas are triangular-shaped pieces of land that are formed at the mouth of a river where it empties into a body of water. The name "delta" comes from the Greek letter delta, which is shaped like a triangle.

Deltas are formed when the river deposits sediment, such as sand, silt, and clay, at its mouth. Over time, this sediment builds up and creates a fan-shaped landform that extends into the water. Deltas are constantly changing and evolving due to the forces of erosion, sedimentation, and tides.

One of the most famous deltas in the world is the Nile Delta in Egypt, which is formed by the Nile River as it empties into the Mediterranean Sea. The Nile Delta is not only a vital agricultural region for Egypt but also a rich and diverse ecosystem that supports a wide variety of plant and animal species.

Another well-known delta is the Mississippi River Delta in the United States, which is formed by the Mississippi River as it flows into the Gulf of Mexico. The Mississippi River Delta is not only an important habitat for wildlife but also a critical area for shipping and commerce.

Overall, deltas are important and unique features of the Earth's landscape that play a crucial role in the environment and economy of the regions where they are located. To learn more about deltas and their significance, you can visit websites such as National Geographic or Encyclopedia Britannica.

In conclusion, the triangular-shaped piece of land at the mouth of a river is called a delta. Deltas are fascinating landforms that are constantly changing and evolving, and they play a vital role in the ecosystems and economies of the regions where they are found.

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