Al Ahsa also known as Hajar is the largest governorate in Saudi Arabia's Eastern Province, named after the Al-Ahsa Oasis. In Classical Arabic…Al Ahsa also known as Hajar is the largest governorate in Saudi Arabia's Eastern Province, named after the Al-Ahsa Oasis. In Classical Arabic, 'Ahsa' means the sound of water underground. It has one of the largest oases in the world with world-renowned date palms and, according to one author, the oases of Al-Hasa and Al Ain are the most important in the Arabian Peninsula. The oasis is located about 60 mi inland from the Arabian Gulf. All urban areas are located in the traditional oasis of Al-Hasa. In addition to the oasis, the county also includes the giant Empty Quarter desert, making it the largest governorate in Saudi Arabia in terms of area. The Empty Quarter has the world's largest oil fields, and connects Saudi Arabia to Qatar, the UAE, and Oman. The Governorate's population is over 1,100,000. In the past, Al-Ahsa belonged to the historical region known as Bahrain, along with Qatif and the present-day Bahrain islands.