WHAT IS A BEACH?A beach is the land along the edge of a body of water and is usually made up of any number of materials – sand, gravel, pebbles, cobbles, rock, or shells. Beach material accumulates on the beach during periods of accretion or moves away from the beach during periods of erosion. Never stationary for long, beaches are always moving. Beaches can be hundreds of kilometers long or very short. The coast is a more general term referring to the junction of land and water, but a beach is made of specific materials like sand, cobbles, or shells.