Great Sand Dunes National Park in Colorado is famous for its giant sand dunes. Sand dunes are landforms that are found in deserts and on beaches. Visitors to the park can surf down the dunes on sleds or boards. An image of sand dunes in front of a mountain and behind a body of water and grass.

Because they can help coastal areas during storms, coastal dunes are protected landforms in several parts of the United States. Give an example of how dunes help coastal areas.