Which desert is known for its extremely arid conditions, unique 'fairy circle' formations, and diverse succulent flora, including Welwitschia mirabilis, a plant with only two leaves that can live for centuries?

1. It's located in southwestern Africa.
2. Diamond mining has historically been a significant activity in this region.
3. The cold Benguela Current influences its climate, creating frequent fog.
4. It's home to desert-adapted wildlife like the gemsbok and brown hyena.