Al Hassa is a well-known region for many Saudis. Al Hassa is an oasis, not an ordinary one though. It is the world’s largest oasis. It stretches out over an area of 20,000 hectares. Not only it is the world’s largest oasis, but also it is Saudi Arabia’s largest agricultural center.
The Jabal Qarah (or Qarah Hills or Mount Qarah) is at a distance of 10 kilometer from Hufuf. Hufuf is a city in the well-known Al Hasa Oasis of the Eastern Region. Hufuf lies about 140km southwest of Dammam and 300km east of Riyadh. Jabal Qarah is well known for its intricate natural caves and is a major tourist attraction in the east of Saudi Arabia.
It is one of the most prominent historical palaces and one of the most important traces of Al-Ahsa in the Eastern Province of Saudi Arabia and is known by many names (Palace of the Dome or Al-Kut Palace). It includes many auxiliary military installations and a large bathroom. In addition, Ibrahim's palace witnessed evidence of the history of abandonment
located in Al-mebraz northern of Al-Hofuf and covers an area about 10000 square meters and 6 meters high walls, one of the highlights of Al-Hasa, characterized by round towers in the four corners, in addition to the three rectangular towers and the main entrance. This palace was under the siege by the troops of Suleiman Pasha for two months and tried to demolish the walls and was not able to open it because of its durability and strength.
The location of pre-Islamic Al-Hasa is of great importance and relevance to Uqair. Artesian wells once fed "a series of interconnected streams and lakes draining north eastward toward the Persian Gulf above Uqair. Reports of the existence of this active ravine system can be traced back to the time of Pliny." (Potts, p. 29). Evidence of this effluent has a great bearing on the exploration of the fort at Uqair and the ancient Arabian city of Gerrha. A large source of fresh water near the Persian Gulf is reason enough to create a trading port located at Uqair and to facilitate the civilization that flourished at Al-Hasa.