 The verdant, UNESCO-listed lands of Al-Ahsa are home to a natural oasis that is one of the largest in the world. The area is widely considered to have the greenest and most fertile land in Saudi Arabias Eastern Province. In addition, amid the date palm groves, farmland and natural springs, visitors can also find historical sites dating back as far as the Neolithic era between 6,500 and 12,000 years ago. 