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See also:TAGUS (Span. Tajo, Portug. Tejo) , the longest See also:river of the Iberian See also:Peninsula . Its length is 565 m., of which 192 are on or within the frontier of See also:Portugal, and the See also:area of its See also:basin is about 31,850 sq . M . The basin is comparatively narrow, and the See also:Tagus, like the other See also:rivers of the Iberian tableland, generallyflows in a rather confined valley, often at the bottom of a rocky See also:gorge below the See also:general level of the adjacent See also:country . The river rises on the western slope of the Muela de See also:San Juan (5225 ft.), a See also:mountain which forms See also:part of the Sierra de Albarracin, 88 m . E. of See also:Madrid . Thence the Tagus flows at first See also:north-westwards, but, after receiving the Gallo on the right, it flows See also:west, and then See also:south-west or west-south-west, which is its general direction for the See also:rest of its course . See also:Regular river See also:navigation begins only at See also:Abrantes, a few See also:miles below which the Tagus is greatly widened by receiving on its right See also:bank the impetuous Zezere from the Serra da Estrella . Passing See also:Santarem, the highest point to which the See also:tide ascends, and the limit of navigation for large sailing vessels and steamers, the river divides below Salvaterra into two arms, called the Tejo Novo (the only one practicable for See also:ships) and the See also:Mar de Pedro . These branches enclose a deltaic formation, a See also:low See also:tract of marshy See also:alluvium known as the Lezirias, traversed by several See also:minor channels . Both branches terminate in a broad tidal See also:lake immediately above See also:Lisbon (q.v.) . The Tagus See also:estuary, though partly blocked by a See also:bar of See also:sand, is one of the See also:chief harbours of south-western See also:Europe . The narrower part of the Tagus basin lies to the south, and the See also:left-See also:hand tributaries which drain it are almost all See also:mere See also:brooks, dry in summer . The See also:principal exception is the Zatas or Sorraia, which, rising in the Serra d'See also:Ossa, flows westwards across the See also:plateau of See also:Alemtejo, and joins the Mar de Pedro . The principal right-hand tributaries, besides the Gallo and Zezere, are the Jarama, descending from the tableland of New See also:Castile a little below See also:Aranjuez, the Alberche and the Tietar, which collect their See also:head See also:waters from opposite sides of the Sierra de Gredos, and the Alagon, from the rough and broken country between the Sierras de Gredos and Gata . |
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