If you were at 0 degrees longitude and 50 degrees north latitude, you would be in the North Sea, specifically in the English Channel.

Here's why:

* 0 degrees longitude is the Prime Meridian, which runs through Greenwich, England.

* 50 degrees north latitude runs through the northern part of Europe, cutting through the UK, France, Belgium, the Netherlands, and Germany.

The intersection of these two lines places you in the waters of the English Channel, which separates England from France.