Which North African nation was historically known as Numidia and is home to seven UNESCO World Heritage Sites, including the ancient Roman ruins of Timgad?

1. Its flag features a crescent and star, with the crescent pointing slightly differently than some other similar flags.
2. The Sahara Desert covers a large portion of its southern territory.
3. It experienced a decade-long civil war in the 1990s.
4. The Berber people form a significant part of its population.