town, northwestern Saudi Arabia. It is situated between Mount Shammar on the north and Mount Salma on the south and is on one of the main pilgrimage routes from Iraq to Mecca. Hāʾil superseded the former administrative centre of the region, Fayd, in about the mid-19th century after the establishment of the local dynasty of Ibn Rashīd. Hāʾil subsequently grew as a result of its direct contact with the Ottoman government and its control of the principal pilgrim route from the east until it rivaled Riyadh in importance and influence. In the 1890s the town was the undisputed capital of all desert Arabia. The family feuds of the local Ibn Rashīd dynasty and its constant wars with its neighbours led to the town's collapse in 1921 under attack by Ibn Saʿūd, founder of the Kingdom of Saudi Arabia. Now of lesser importance, Ḥāʾil is primarily a regional market and oasis, producing dates, fruit, and grain. Pop. (1974) 40,502.