Yemen is. It is on the gulf of Aden and north of Somalia.
Yemen and Oman are due south of Saudi Arabia.
Saudi Arabia, Yemen and UAE are the neighbours of Oman
South East
Oman is not part of Saudi Arabia because Oman and Saudi Arabia is a different countries.
Yemen and Oman border Saudi Arabia to the south.
Yemen and on the south-east Oman.
Yemen and Oman.
two of them are sultanate of oman and saudi arabia
Oman is next to UAE in the north, Yemen in the south and Saudi Arabia to the west.
Saudi Arabia and Oman
Yemen (southwest of SA) and Oman (southeast of SA).
Yemen and some part of Oman south east