Which North African country is known for its unique blend of Berber, Arab, and European cultures, and features diverse landscapes ranging from the Sahara Desert to the Atlas Mountains?

1. Its capital city is a major port on the Mediterranean Sea.
2. It is home to ancient Roman ruins, including the well-preserved city of Dougga.
3. The country has a significant agricultural sector, particularly in olive oil production.
4. The national dish often includes couscous.