CHICLANA, or CHICLANA DE LA FRONTERA  , a town of southern Spain, in the province of Cadiz, 12 M. by rail S.E. of Cadiz . Pop . (1900) Io,868 . Chiclana occupies a fertile valley, watered by the river Lirio, and sheltered, on the north and south, by low hills covered with vines and plantations . It faces the gulf of Cadiz, 3 M . W., and, from its mild climate and pleasant surroundings, is the favourite summer residence of the richer Cadiz merchants; its hot mineral springs also attract many visitors . In the neighbourhood are the Roman ruins of Chiclana la Vieja, the town of Medina Sidonia (q.v.), and, about 5 M . 5.,,, the battlefield of Barrosa, where the British under Sir Thomas Graham (Lord Lynedoch) defeated the French under Marshal Victor, on the 5th of March 1811 .