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A coast is the area where land meets the sea or ocean.

Coastlines are changing all the time as new waves roll in and out and tides rise and fall every six hours or so. Over longer periods coastlines are reshaped by the action of waves and the corrosion of salty water.

Canada is the country with the longest coastline (152,100 miles) and Monaco has the shortest coastline (3.5 miles).

The human influence on climate change is thought to be a contributing factor of an accelerated trend in sea level rise which threatens coastal habitat.

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