What is atoll meaning?

An atoll is a ring-shaped coral reef, island, or series of islands that surround a shallow lagoon. Atolls are formed over time by the growth of coral reefs on the rim of a submerged volcanic crater or on a former island that sunk into the ocean. They are typically found in warm and clear tropical waters and are home to a diverse array of marine life. Atolls are often sought after for tourism and are popular spots for scuba diving and snorkeling. They can also be vulnerable to rising sea levels and climate change. The word "atoll" is believed to have originated from the Dhivehi language of the Maldives.