Other forms: marinas
A marina is a dock, especially a fancy one used for sailboats and yachts. If you live in a harbor town, you can walk down the marina to watch boats come and go.
A marina differs from a port, which is also a harbor where boats can dock, because it's designed for small boats and yachts, rather than large ships. Seaside towns and cities often have public marinas for mooring boats, and private yacht clubs also have marinas. The word marine, which means "pertaining to the sea," can help you remember that a marina is a place where boats dock. The Latin root of both is mare, "the sea."