A pier is a long platform built on piles or columns. A pier usually goes out to sea where the water is deeper making it easier for ships to dock. The seawater flows around the piles below the pier. The pier does not affect the movement of the tide or waves. Piers can be light structures that can also be used by small boats to tie up.
Larger piers may be used by ferries, while very large piers may take ships; some have trains moving along the middle.
Piers are also called jetties.
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