Explanation:

- Tunisia: Located in North Africa, Tunisia borders the Mediterranean Sea along its northern and eastern coasts, making it a Mediterranean country.

- Libya: Also situated in North Africa, Libya has an extensive coastline along the Mediterranean Sea to the north, qualifying it as a Mediterranean country.

- North Sudan: North Sudan, or simply Sudan, is located in northeastern Africa. It does not have a coast on the Mediterranean Sea. Hence, it is not a Mediterranean country.

- Egypt: With a northern coastline along the Mediterranean Sea, Egypt is unquestionably a Mediterranean country, lying in the northeast corner of Africa.

North Sudan is NOT a Mediterranean country.