The Atlantic Northeast is an area in the Eastern part of the United States that is close to the Atlantic Ocean. It includes states like Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Pennsylvania, Delaware, Maryland, and Washington D.C.
The Atlantic Northeast has lots of different kinds of weather, but it's usually cooler than other parts of the country. This is because it's closer to the North Pole where it's colder, and because it's near the ocean which can make the air cooler.
People who live in the Atlantic Northeast can do lots of fun things like go to the beach, ski in the winter, or see the colorful leaves during the fall. There are also lots of big cities in this area, like New York City, Philadelphia, and Washington D.C.
The Atlantic Northeast is an important part of the United States because lots of people live there, and there are many important industries such as finance, technology, and healthcare. It's a great place to live, work, and visit!