“The largest self-contained oasis in the world is the Al-Ahsa Oasis. Located in south-eastern Saudi Arabia, there are more than 2.5 million palm trees in the oasis, which is fed from a huge underground aquifer, which allows agriculture all year round in a region that is otherwise sand desert. The oasis is named after the Al-Ahsa region in which it lies, and occupies around 85.4 square kilometres (32.9 square miles) irrigated by the flow of more than 280 artesian springs.”
-Guinness Book of World Records, in an announcement confirming Al-Ahsa in Saudi Arabia as the largest self-contained oasis in the world. [Guinness Book]
