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The Nuttall Encyclopedia
The largest river of the Spanish peninsula, issues from the watershed between the provinces of Guadalajara and Teruel; follows a more or less westerly course across the centre of the peninsula, and, after dividing into two portions below Salvaterra, its united waters enter the Atlantic by a noble estuary 20 m. long; total length 566 m., of which 190 are in Portugal; navigable as far as Abrantes.
Wood, James, ed. Entry for 'Tagus'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/t/tagus.html. Frederick Warne & Co Ltd. London. 1900.