Long Island Sound is a vast marine sound and tidal estuary stretching 110 miles along the Connecticut coast, formed by glacial activity over 22,000 years ago. It is recognized as an Estuary of National Significance and is the most used estuary in North America, offering a rich mix of saltwater from the Atlantic and freshwater from numerous tributaries. The Sound varies in width up to 21 miles and features depths ranging from 65 to 230 feet, creating a diverse marine environment. With over 100 species of fish, it provides some of the very best inshore and nearshore saltwater fishing in the Northeast, supported by extensive public access, a robust charter fleet, and a dynamic, evolving ecosystem.