A docking site is a place where boats and ships can be moored. It is typically a sheltered area with access to the sea. The four most common types of docking sites are marinas, wharfs, harbors, and piers. Marinas are usually large, commercial facilities with slips for mooring boats and services such as fuel, repairs, and supplies. Wharfs are structures built along the shoreline that provide access to the water. Harbors are sheltered bodies of water that provide safe anchorage for boats and ships. Piers are long, narrow structures extending from the shoreline into the water.