This is the 9221st most frequent Japanese word.
環礁
An atoll; a ring-shaped coral reef, island, or series of islets surrounding a lagoon.
In this sentence, '環礁' (atoll) refers to its general definition as a natural feature.
環礁は、美しい自然の一部です。
Atolls are a beautiful part of nature.
Here, '環礁' is used to describe a habitat for biodiversity.
環礁には多様な動植物が生息しています。
Various flora and fauna inhabit the atolls.
The term '環礁' in this sentence is used within the context of marine ecosystems associated with atolls.