Nobiin, also known as Halfawi, Mahas, or Dongulawi, is a Northern Nubian language of the Nilo-Saharan language family. "Nobiin" is the genitive form of ("Nubian") and literally means "(language) of the Nubians". Another term used is , meaning "the Nubian language". At least 2500 years ago, the first Nubian speakers migrated into the Nile valley from the southwest. Old Nubian is thought to be ancestral to Nobiin. Nobiin is a tonal language with contrastive vowel and consonant length. The basic word order is subject–object–verb. Nobiin is currently spoken along the banks of the Nile in Upper Egypt and northern Sudan by approximately 610,000 Nubians. Present-day Nobiin speakers are almost universally multilingual in local varieties of Arabic, generally speaking Modern Standard Arabic (for official purposes) as well as Saʽidi Arabic or Sudanese Arabic. Many Nobiin-speaking Nubians were forced to relocate in 1963–1964 to make room for the construction of the Aswan Dam at Aswan, Egypt and for the upstream Lake Nasser. There is no standardised orthography for Nobiin. It has been written in both Latin and Arabic scripts; also, recently there have been efforts to revive the Old Nubian alphabet. This article adopts the Latin orthography used in the only published grammar of Nobiin, Roland Werner's (1987) Grammatik des Nobiin. Geography and demography Before the construction of the Aswan Dam, speakers of Nobiin lived in the Nile valley between the third cataract in the south and Korosko in the north. About 60% of the territory of Nubia was destroyed or rendered unfit for habitation as a result of the construction of the dam and the creation of Lake Nasser. At least half of the Nubian population was forcibly resettled. Nowadays, Nobiin speakers live in the following areas: (1) near Kom Ombo, Egypt, about 40 km north of Aswan, where new housing was provided by the Egyptian government for approximately 50,000 Nubians; (2) in the New Halfa Scheme in the Kassala, Sudan, where housing and work was provided by the Sudanese government for Nubians from the inundated areas around Wadi Halfa; (3) in the Northern state, Sudan, northwards from Burgeg to the Egyptian border at Wadi Halfa. Additionally, many Nubians have moved to large cities like Cairo and Khartoum. In recent years, some of the resettled Nubians have returned to their traditional territories around Abu Simbel and Wadi Halfa. Practically all speakers of Nobiin are bilingual in Egyptian Arabic or Sudanese Arabic.