Peninsular Arabic
Peninsular Arabic, or Southern Arabic, are the varieties of Arabic spoken throughout the Arabian Peninsula. This includes the countries of Saudi Arabia, Yemen, Oman, United Arab Emirates, Kuwait, Bahrain, Qatar, Southern Iraq and the tribal people of Jordan (the native Jordanians).
Eastern Arabia
The Arabs of Eastern Arabia speak a dialect known as Gulf Arabic. Most Saudis do not speak Gulf Arabic because most Saudis do not live in Eastern Arabia. There are approximately 2 million Gulf Arabic speakers in Saudi Arabia, mostly in the coastal eastern region. Before the GCC was formed in 1981, the term "Khaleeji" was solely used to refer to the inhabitants of Eastern Arabia.