- Capital: Muscat
- Population: 4,527,000
- Surface Area: 309,500 km2
- Currency: Omani Rials (1 EUR=0.4126 OMR)
- Religion: Mostly Islam
- Belongs to: ACD, Arab League, GCC, IMF, UN
- Capital: Nouakchott
- Population: 4,614,974
- Surface Area: 1,030,700 km2
- Currency: Ouguiya (1 EUR=42.2100 MRO)
- Religion: Mostly Islam
- Belongs to: ACP, AMU, Arab League, IMF, UN, AU