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  1. Atoll - Wikipedia

    There may be coral islands or cays on the rim. [2][3] Atolls are located in warm tropical or subtropical parts of the oceans and seas where corals can develop. Most of the approximately …

  2. Atoll | Definition & Facts | Britannica

    atoll, coral reef enclosing a lagoon. Atolls consist of ribbons of reef that may not always be circular but whose broad configuration is a closed shape up to dozens of kilometres across, enclosing …

  3. 10 Most Captivating Atolls in the World - Touropia

    Mar 19, 2025 · As reef building corals thrive only in warm waters, atolls are only found in the tropics and subtropics. In other words; atolls are made up of turquoise lagoons and colorful …

  4. Atoll - National Geographic Society

    Atolls are sparsely populated, low-lying islands whose white, sandy beaches and placid lagoons are ideally suited to the tourism industry. Island nations made of atolls include Maldives, in the …

  5. What Are Atolls and How Do They Form? - Biology Insights

    What Are Atolls and How Do They Form? Atolls are ring-shaped coral reefs that encircle a lagoon, often with small islands or islets dotting the reef crest. These formations are found primarily in …

  6. What Is an Atoll? Formation, Features & Marine Life

    May 10, 2025 · Atolls aren’t distributed evenly across Earth’s oceans but instead concentrate in specific regions with the right geological conditions. The vast majority exist within the tropical …

  7. What Is An Atoll? - WorldAtlas

    Apr 17, 2019 · There are four types of coral reefs including table reef, barrier reef, fringing reef, and atoll. An atoll is a type of coral reef with a coral rim that partially or completely surrounds a …

  8. Geography of Atolls

    Aug 12, 2024 · Atolls are ring-shaped coral reefs, islands, or a series of islets that encircle a lagoon either partially or completely. The shape of atolls varies with some being elliptical or …

  9. What Is an Atoll and How Does It Form? - thedailyECO

    An atoll is a coral island that is characterized by having a ring shape, enclosing an interior lagoon that is connected to the ocean. Atolls are formed by the accumulation of corals at the base of …

  10. ATOLL Definition & Meaning - Merriam-Webster

    The meaning of ATOLL is a coral island consisting of a reef surrounding a lagoon. Did you know?