- Capital: Sanaa
- Population: 28,498,687
- Surface Area: 527,970 km2
- Currency: Yemeni rials
- Belongs to: Arab League, IMF, UN
- Capital: Muscat
- Population: 4,179,000
- Surface Area: 309,500 km2
- Currency: Omani Rials (1 EUR=0.4669 OMR)
- Religion: Mostly Islam
- Belongs to: ACD, Arab League, GCC, IMF, UN