A maritime nation is any nation which borders the sea and utilizes it for any of the following: commerce and transport, war, to define a territorial boundary, or for any maritime activity (activities using the sea to convey or produce an end result).

The Netherlands and Japan are examples of maritime nations while fishing is a common maritime activity.

Maritime cultures have left a strong imprint on our daily lives, with phrases such as "Fish out of Water", "Out of commission", "Down the hatch", and "Learn the ropes" all having originated from maritime terminology.

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