A man-made atoll is a human-engineered structure designed to mimic the natural formation of an atoll, which is a ring-shaped coral reef surrounding a lagoon. These artificial islands are often created to support marine life, protect coastlines, or provide recreational spaces. They can be constructed using various materials, including concrete and sand, and are strategically placed in coastal areas. These atolls can also serve as habitats for marine species, promoting biodiversity. Additionally, they may help in mitigating the effects of coastal erosion and rising sea levels, making them valuable in the context of climate change and environmental conservation efforts.