Beihan or Bayhan ( ), officially the Emirate of Beihan ( ), was a state in the British Aden Protectorate and the Federation of South Arabia. Its capital was Suq Abdulla, now called Beihan. The Emirate was abolished in 1967 upon the founding of the People's Republic of South Yemen and is now part of the Republic of Yemen. History It was not until the question of demarcating the northeastern frontier of Beihan arose that the British would have any intercourse with it. In December 1903 a treaty was concluded with Sharif Ahmed bin Muhsin. This treaty was considered to include the Ahl Masabein in its terms. He drew a monthly stipend of 30 dollars. In June 1930 the troops of the Imam of Sanaa who had advanced to the Harib district, north-west of Beihan, with headquarters at Al Joba and Darb al Ali, began to encroach on Al Ain, which is inhabited by Masabi tribesmen. In 1955, sometime before the 1st of July, Beihan settled a border treaty with North Yemen. The emirate was abolished in 1967. Geography Beihan lies to the north of the Beidha district and north-west of the Upper Aulaqi country. It lies on either side of the Wadi Beihan, in the valley of which the bulk of the population reside. The lower portion of the Wadi Beihan is occupied by the Sharif and his relations together with the Bal Harith tribe and the upper portion by the Ahl Masabein, a powerful tribe, who form the bulk of the fighting men in Beihan. The headquarters of the Sharif is at An Nuqub, of the Bal Harith at As Seilan and of the Masabein at Beihan al Qasab. Beihan is a valley connected between al-Baidha in the north-west, Ma'rib in the east and Ataq in the south. It is a fertile valley irrigated by water streams fall from the northern mountains as well as from the dug wells. The main cultivated crops are dates, cereals and citrus and people depend on livestock to a large extent to survive. Nonetheless, people increasingly adopt trade and exchange commerce; in addition to incorporate to the government business. Inhabitants Bayhan valley historically had several main groups. The Musabein Tribe living in the south which was dominated by Al-Saleh (Ahmed Saif tribe) and the Alfatima (Naji Alawi tribe). These two factions were engaged in constant feuds. Historically the middle of the valley