After the Anizah the most numerous confederation in Arabia, the Harb held the Red Sea coast from Yanbu to Qunfudha, the mountain country between Medina and Mecca, and desert pastures reaching across Wadi al-Rummah. Part settled and part nomadic, they controlled the Hejaz pilgrim roads and drew the surra (subsidy) from both the Syrian and the Egyptian hajj caravans, robbing them when it was not paid; they were the last tribe of the Hejaz to submit to the Wahhabis.
Not an ending: the eastern Harb paid tribute to the Rashidi emirs and later fell under Sharifian then Saudi authority as the Hejaz was conquered in 1924–25 and the Kingdom of Saudi Arabia proclaimed in 1932. The confederation continues, largely settled, in Saudi Arabia today.
Contains the fullest early account of the Beni Harb specifically — sub-tribe by sub-tribe, with strengths, shaikhs and the Fura date district — from an observer resident in the Hejaz in the 1810s. Full text read on the Internet Archive.
Its 'Tribes of the Central West' chapter gives the Harb dirah in named landmarks (Yanbu, Qunfudha, Jabal Abanat, Wadi al-Rummah, Harrat Qishb) — the single most precise pre-modern statement of this confederation's range. Full text read on the Internet Archive.