The North Sea is a piece of flooded land that is only 90 meters deep.
And that's not deep for a sea. During the last ice age, this sea didn't even exist. A person could literally walk from England to the Netherlands. The many sandbanks make the North Sea more than just a unique and changing underwater landscape where a lot of fresh and salt-water mixes. Coral even grows in the North Sea along with 2000 other species of life. In addition, approximately 1 million migratory birds pass through the coastal area of the North Sea every year.
