Okay kiddo, you know how sometimes when you go to the beach, there's a big open space with sand and water as far as you can see? Well, sometimes there are beaches in places where the water is not quite as open.
Estuaries and bays are like big spots where freshwater (like from rivers) meets saltwater (from the ocean). This mixing of waters creates a kind of special environment where special plants and animals live. And sometimes, along the edges of these places, there are sandy areas called beaches!
These beaches might look a little different than the big, open beaches you might be used to. They might be smaller, or the sand might be a little different color. But they can still be a great place to play and explore. Plus, you might even get to see some animals that you wouldn't see on a regular beach, like crabs or birds that live in the estuary or bay environment.
Just like any beach, it's important to be safe and follow the rules. Make sure to stay away from any dangerous areas or animals, and always swim with an adult if the water is deep. But if you get a chance to visit a beach in an estuary or bay, it can be a really cool experience!