was called Beira Litoral, i.e. Litoral/Coastal Beira, older and traditional Beira Province was an inland province in the Highlands, while all Central Coastal Lowlands region of Mainland Portugal, from south of the Douro river, in the north, till the northern banks of the Tagus river, in the south, was the province of Estremadura until the middle of the 18th century) ("Beira" name means edge, slope, mountain slope, or border, with the specific meaning of "Mountainous Borderland" or "Edge Borderland") (until the 14th century the broad or collective name for all the portuguese territories south of Douro river was "Extremadura", i.e. "Far Border Land", the name derives from "Extrema", "Extremada" – extreme in the sense of extreme borderland, far borderland) (this name is cognate and has equivalents with the Leonese, Castilian and Aragonese Extremaduras, that were also old Borderlands at the beginning of the Christian Reconquista) (therefore "Estremadura" and "Beira" names had the meaning of "Borderland" in the context of the Christian Reconquista) Northern Coastal Central (more features in common with Central and Southern dialects, but in the phonetics, some areas, mainly in Aveiro District, don't distinguish between b [b] and v [v] phonemes, i.e. they don't have v [v] phoneme, a typical feature of the Northern dialects) Aveiro dialect (in most of the Aveiro District) (Portuguese District = County) Coimbra dialect (in west Coimbra District) (Portuguese District = County) Southern Coastal Central (Standard European Portuguese is mainly based on this dialect with also important contribution from Coimbra, i.e. the coastal central region, the ancient and traditional Portuguese Extremadura, from north till south – Aveiro, Coimbra, Leiria, Santarem and Lisbon, is the main basis of Modern Standard European Portuguese) Leiria District dialect Inland Lisbon District dialect Lisbon dialect (early Lisbon dialect, Lisboeta, was only spoken in Lisbon itself and was an enclave, however today it is spoken in Lisbon metropolitan area, and is a very widespread dialect, many dialects are under pressure and being replaced by the standard language that closely resembles Lisbon dialect) Standard European Portuguese (mainly based on the Coastal Central dialects - the dialect of the historical Estremadura) Inland Southern Central (Beira-Baixa-Far Northern Alto-Alentejo) (a divergent group of Portuguese dialects in phonetics and some vocabulary, it forms its own dialectal group) (its more typical phonetic feature is the presence of the vowels ö [ø] and ü [y], phonemes that don't exist in the other Portuguese dialects or other