Editing Tagus (section)

=== Course ===
The river flows through Spain for {{Convert|816|km|abbr=on}}, passing through four autonomous communities (Aragón, Castilla-La Mancha, Madrid, and Extremadura) and a total of six provinces (Teruel, Guadalajara, Cuenca, Madrid, Toledo, and Cáceres). After forming a {{Convert|47|km|abbr=on|adj=on}} border between Spain and Portugal, it enters Portugal.<ref>The 47 km stretch where the river forms the border between Spain and Portugal is known as the "International Tagus".</ref> In Portugal, it flows for {{Convert|145|km|abbr=on}} through the traditional regions of Beira Baixa, Alto Alentejo, Ribatejo, and Estremadura, which include the districts of Castelo Branco, Portalegre, Santarém, and Lisbon.

The most important cities along its course are Aranjuez, Toledo, and Talavera de la Reina in Spain; and Abrantes, Santarém, and Lisbon in Portugal.