Beach
From Beachapedia
Accumulation of wave-deposited or stream-deposited loose sediment, usually sand, that extends from the outermost breakers to the landward limit of the wave and swash action.
For an in-depth understanding of how beaches form and change, watch the 20-minute video The Beach - A River of Sand (1965) which was made by
Doug Inman, a marine geologist at Scripps Institution of Oceanography.