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Islet

geography Maturity 7-9 Next article →

An islet is a small island that exists in various bodies of water. These landforms can be found in oceans, seas, lakes, or rivers. While definitions of an islet vary, they are generally much smaller than standard islands. Many islets are unnamed and possess very little vegetation. This lack of plant life often means they cannot support human habitation.

Rockall - geograph.org.uk - 1048791
Rockall - geograph.org.uk - 1048791

An islet may be a permanent feature or a tidal one. A tidal islet might only appear when the water level is low.

The physical makeup of an islet depends on its environment and geological history. Some islets are composed entirely of solid rock. Others are formed from accumulations of fine sand or hard coral. For example, a reef islet might be built from broken coral and sand. In Polynesia, these specific types of islets are known as motu.

Tahitian sunset
Tahitian sunset

Some islets are also described as subsidiary islets. These are small land features that sit isolated by water near a larger island. In an atoll, any piece of land that emerges from the water is also called an islet.

Different regions of the world use specific terminology to describe these small landforms. In the Caribbean and the West Atlantic, a sand islet is often called a cay or a key. The Florida Keys are a well-known example of this type of islet.

Bangchuidao Island
Bangchuidao Island

In England, the terms ait or eyot are used for small islands found in the River Thames. In Scotland, the Gaelic term inch is used to refer to smaller islands. The French use the suffix -hou, derived from the Scandinavian -holm, to name islets in the Channel Islands.

Danmark Sandvika Bærum
Danmark Sandvika Bærum

These names often provide clues about the islet's origin or location.

Islets can take many distinct shapes and forms. A sea stack is a thin, vertical landform that juts out of the water. A skerry is a small, rocky island that is typically too small for people to live on. In Ireland, these rocky islets are often called skerries. There are also sandbars or shoals, which are exposed accumulations of sand. Some islets are simply known as river islands when they sit within a current.

Mokolea Rock 2
Mokolea Rock 2

Even a single rock sticking out of the sea can be classified as an islet if it meets the size and vegetation criteria.

The status of an islet can lead to significant legal and economic consequences. Under Article 121 of the UN Convention on the Law of the Sea, the distinction between an island and a rock is vital. The law states that rocks which cannot sustain human habitation or economic life of their own have limited rights. Specifically, they do not receive an exclusive economic zone or a continental shelf. This can lead to long-term disputes between nations.

Mokolea Rock 2
Mokolea Rock 2

For instance, Romania and Ukraine had a dispute involving Snake Island. The International Court of Justice has also dealt with disputes involving the islet of Filfla between Libya and Malta.

There are thousands of islets distributed across the globe. The Stockholm archipelago in Sweden contains approximately 24,000 islands and islets. These landforms exist in extreme environments, from the Arctic Ocean to the equatorial Atlantic. Examples include the Rockall islet in the North Atlantic and the Dry Tortugas in the Florida Keys. You can find islets in the South Pacific, such as Ball's Pyramid. They are also found in the Mediterranean, such as the Columbretes Islands.

Rockall - geograph.org.uk - 1048791
Rockall - geograph.org.uk - 1048791

Understanding islets helps scientists and geographers study coastal and oceanic systems. They provide information about coral growth, sand movement, and sea-level changes. Because they are often small and isolated, they serve as unique points of study for geology and biology. Whether they are tiny rocks or larger sand formations, islets are essential components of the Earth's geography. They connect the mainland to the deep sea through complex processes of erosion and accumulation.

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File:Rockall - geograph.org.uk - 1048791.jpg
Rockall - geograph.org.uk - 1048791.jpg
File:Bangchuidao Island.JPG
Bangchuidao Island.JPG
File:Mokolea Rock 2.jpg
Mokolea Rock 2.jpg
File:Danmark Sandvika Bærum.jpg
Danmark Sandvika Bærum.jpg
File:Tahitian sunset.jpg
Tahitian sunset.jpg
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