An INLET is a narrow body of water that connects to a larger body of water, such as an ocean or a lake. Fjords and sounds are both types of inlets, but they differ in their geography and formation. Fjords are long, narrow, deep inlets that are created by glaciers carving out valleys in the landscape. Sounds are also long, narrow inlets, but they are typically shallower than fjords and are formed by the sea flooding valleys between landmasses.