133 countries and territories border the ocean including four of the five largest countries in the world. It has some of the busiest seas like the Mediterranean Sea, the Black Sea, and the Caribbean Sea. Canary Islands, New found land, and Azores are some of the important islands in this ocean.
What do you mean by borders? Is it near the ocean? Or with sea near the countries?
As discussed, there are countries that has no sea. When we say borders, those are water boundaries.