Eastern Province, Saudi Arabia
The official language of Saudi Arabia is Arabic. The three main regional variants spoken by Saudis are Hejazi Arabic, Najdi Arabic, and Gulf Arabic. There are approximately 2 million Gulf Arabic speakers in Saudi Arabia, and the dialect is only spoken in the Eastern Province. The remaining Arabic speakers in the province speak one of the other two dialects, more commonly the Najdi dialect. Saudi Sign Language is the principal language of the deaf community. The large expatriate communities also speak their own languages, the most numerous of which are Indian languages, Filipino/Tagalog, Egyptian Arabic, Indonesian, Rohingya, and Urdu.Saudi Aramco, the state-owned oil producing company of Saudi Arabia, is based in Dhahran, which is located in the Eastern Province, and most decisions on oil policy and production that affect the global economy are made there. The kingdom's main oil and gas fields are mostly located in the Eastern Province, onshore and offshore. Notable among these are the Ghawar Field and the largest crude increment in the world. Petroleum from the fields is shipped to dozens of countries from the oil port of Ras Tanura and is also used as feedstock in numerous industrial plants in Jubail.
Influence of Arabic on other languages
Arabic has had a great influence on other languages, especially in vocabulary. The influence of Arabic has been most profound in those countries dominated by Islam or Islamic power. Arabic is a major source of vocabulary for languages as diverse as Amharic, Baluchi, Bengali, Berber, Bosnian, Chaldean, Chechen, Croatian, Dagestani, English, German, Gujarati, Hausa,
Hebrew, 
Hindi,
Kazakh, Kurdish, Kutchi, Kyrgyz, Malay (Malaysian and Indonesian), Pashto, Persian, Punjabi, Rohingya, Romance languages (French, Catalan, Italian, Portuguese, Sicilian, Spanish, etc.) Saraiki, Sindhi, Somali, Sylheti, Swahili, Tagalog, Tigrinya, Turkish, Turkmen, Urdu, Uyghur, Uzbek, Visayan and Wolof as well as other languages in countries where these languages are spoken. For example, the Arabic word for "book" (كتاب "kitāb") is used in most of the languages listed. Other languages such as Maltese and Nubi derive from Arabic, rather than merely borrowing vocabulary. Spanish has the largest Arabic influenced vocabulary outside the Islamic world due to Muslim rule in the Iberian Peninsula from 711 until 1492 known as Al-Andalus, although Spain's re-christianization and resulting loss of contact with Quranic Arabic has led to a significant shift in both meaning and pronunciation of Spanish words of Arabic etymology.