The Siwa Oasis is an urban oasis in Egypt between the Qattara Depression and the Great Sand Sea in the Western Desert, 50 km (30 mi) east of the Libyan border, and 560 km (348 mi) from Cairo. About 80 km (50 mi) in length and 20 km (12 mi) wide, Siwa Oasis is one of Egypt's most isolated settlements with about 33,000 people, mostly Berbers, who developed a unique and isolated desert culture and a language called Siwi; they are also fluent in the Egyptian dialect of Arabic which is called "Masry" meaning Egyptian.

Its fame derives primarily from its ancient role as the home to an oracle of Ammon, the ruins of which are a popular tourist attraction which gave the oasis its ancient name Oasis of Amun Ra.