a river of Spain, which rises out of the earth in Mancha, in the Lagunen of Ruidera, runs twenty-five miles and a quarter north-west, and, after disappearing under the earth, rises to light again in Estremadura, runs through a part of Portugal, and falls into the ocean on the confines of Algarve, near Rebondela. Its whole course is 347 miles, and it is navigable for forty-six miles and a quarter. Its tributary streams are, Bullaque, Suja, Mutachel, Guadayra, Ardila, Albarracena, and Chaya.