Cay is a small, low-lying island or sandbank, often found in tropical and subtropical regions. These landforms are typically formed by the accumulation of sand and coral debris, and they can be surrounded by shallow waters. Cays are often part of larger ecosystems, such as coral reefs, and can provide habitats for various species of birds and marine life. Many cays are uninhabited or have limited human activity, making them important for conservation. Some cays serve as popular tourist destinations, offering opportunities for activities like snorkeling and beachcombing. They can also play a role in protecting coastal areas from erosion and storm surges.