GATA, Rio de, a small river of Spain, in the province of Estremadura. It rises near the town of the same name from numerous large springs in the Sierras de Gata, Jalama, Moncayo, &c., which all unite near a mill called the Infernal, on the road which passes between the Piezas de la Moraleja and Perales, afterwards falling into the Arrago, which joins the Alagon about four miles below the town of Casillas.