What is Beach?

Legal Definition
A beach is a landform along a body of water. It usually consists of loose particles, which are often composed of rock, such as sand, gravel, shingle, pebbles, or cobblestones. The particles comprising a beach are occasionally biological in origin, such as mollusc shells or coralline algae.

Some beaches have man-made infrastructure, such as lifeguard posts, changing rooms, and showers. They may also have hospitality venues (such as resorts, camps, hotels, and restaurants) nearby. Wild beaches, also known as undeveloped or undiscovered beaches, are not developed in this manner. Wild beaches can be valued for their untouched beauty and preserved nature.

Beaches typically occur in areas along the coast where wave or current action deposits and reworks sediments.
-- Wikipedia
Legal Definition
This term, in its ordinary signification, when applied to a place on tideratera, means the space between ordinary high and low water mark or the space over which the tide usually ebbs and flows. It is a term not more significant of a sea margin than "shore." Niles v. Patch, 13 Gray (Mass.) 257.

The term designates land washed by the sea and its waves; is synonymous with "shore." Littlefield v. Littlefield, 28 Me. 180.

When used in reference to places near the sea, beach means the land between the lines of high water and low water, over which the tide ebbs and flows. Hodge v. Boothby, 48 Me, 68. Beach means the shore or strand. Cutis v. Hussey, 15 Me. 237. B

each, when used in reference to places anywhere in the vicinity of the sea, means the territory lying between the lines of high water and low water, over which the tide ebbs and flows. It is in this respect synonymous with "shore," "strand," or "flats." Doane v. Wili-cutt, 5 Gray (Mass.) 328, 335, 66 Am. Dec. 369.

Beach generally denotes land between high and low water mark. East Hampton v. Kirk, 6 Hun (N. Y.) 257. To "beach" a ship is to run it upon the beach or shore; this is frequently found necessary in case of fire, a lcak, etc.
-- Black's Law Dictionary
Legal Definition
The sea shore. (q. v.)
-- Bouviers Law Dictionary