A beach is a narrow, gently sloping strip of land that lies along the edge of an ocean, lake, or river. Materials such as sand, pebbles, rocks, and seashell fragments cover beaches. Most beach materials are the products of weathering and erosion.
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The word 'beach' comes from Old English 'bæce' (stream). In the period of King Henry VIII the round worn-out pebbles on the British seashore were called beaches.
Boundaries are one of the most important ways to define a sea or a lake. Many lakes gain water from rainfall and streams, and they can feed into rivers that flow into the ocean. Seas are bounded by land to some extent, but they are still part of the ocean.