A more thorough explanation:

A ship channel is a section of a body of water that is deep enough for large vessels to travel safely. This term is commonly used in maritime law.

For example, the Houston Ship Channel is a 52-mile long channel located in Texas that connects the Port of Houston to the Gulf of Mexico. It is a vital waterway for the transportation of goods and materials, and is deep enough to accommodate large cargo ships.

Another example is the Suez Canal, which is a ship channel that connects the Mediterranean Sea to the Red Sea. It allows ships to avoid the long and dangerous trip around the southern tip of Africa.

These examples illustrate how ship channels are important for the transportation of goods and materials, and how they provide a safe and efficient route for large vessels to travel through.