A channel is a wide strait or waterway between two landmasses that lie close to each other. A channel can also be the deepest part of a waterway, or a narrow body of water that connects two larger bodies of water.

Some channels were created by glaciers that carved out deep canyons between two landmasses. Channels created by people are usually dug from the bottoms of shallow waterways so large ships can pass through them. These are called navigation channels.

The English Channel runs between the countries of England and France. The English Channel is 560 kilometers (348 miles) long and 34 kilometers (21 miles) wide at its narrowest point, the Strait of Dover. The English Channel has long served as a natural barrier between England and the rest of Europe.

The Ambrose Channel, which leads into New York Harbor, has been artificially deepened so large ships full of cargo can make it into the harbor from the Atlantic Ocean.