1. Desert:
- The desert biome covers the majority of Saudi Arabia.
- Characterized by extreme temperatures, low rainfall, and arid conditions.
- Subtypes include sand dunes, rocky deserts (hamadas), and gravel deserts (serirs).
2. Steppe:
- Found in the northern and southern regions of the country.
- Transitional zone between desert and grassland, with moderate rainfall and seasonal vegetation.
3. Mediterranean:
- Occurs along the western coastal region.
- Influenced by the Mediterranean Sea, with mild winters and hot, dry summers.
- Supports Mediterranean-type vegetation such as evergreen trees and shrubs.
4. Mountainous:
- Found in the southwestern part of Saudi Arabia, in the Asir region.
- High-altitude areas with cooler temperatures and increased rainfall.
- Montane forests and diverse flora and fauna.
5. Coastal:
- Includes the Red Sea coast and Persian Gulf coastline.
- Characterized by sandy beaches, coral reefs, and mangrove forests.
- Supports a diverse range of marine life.