Estuary

Okay kiddo, an estuary is like a big mixing bowl where fresh water from rivers and salty water from the ocean meet and mix together. It's kind of like when you mix different colored paint together and get a new color.

This mixing happens at the place where the river meets the ocean and creates a unique environment with lots of different plants and animals. Think of it like a big party where everyone is having a good time and hanging out together.

Estuaries are important because they help filter pollution and provide a habitat for lots of different fish, birds, and other creatures. So, it's kind of like a giant playground where everyone can have fun and help keep the environment healthy.