a river of Spain, province of Andalusia, the fifth in point of length, and the sixth in the Guano number and importance of its tributaries in the peninsula. It rises in the Sierras de Alcaraz, Segura and Cazorla, and falls into the ocean by Sanlucar de Barrameda, after a course of 412 miles. It flows first in a northerly direction, then W., then S.W., and ultimately towards the S., draining a basin of 25,680 square miles. In its course it passes through and drains the four provinces of Jaen, Cordoba, Sevilla, and Cadiz. Its source-spring is 4 miles W. of the town of Quesada, Sierra de Cazorla, province of Jaen.