Vietnam is not the ninth most populous Asian country.
Oman is a country situated in Southwest Asia , bordering the Arabian Sea , Gulf of Oman , and Persian Gulf , between Yemen and United Arab Emirates -LRB- UAE -RRB- .. Oman. Oman. Southwest Asia. Southwest Asia. Arabian Sea. Arabian Sea. Gulf of Oman. Gulf of Oman. Persian Gulf. Persian Gulf. Yemen. Yemen. United Arab Emirates. United Arab Emirates