The Ardila (Spanish pronunciation: [aɾˈðila]; Portuguese pronunciation: [ɐɾˈðilɐ]) is a river of Spain and Portugal and a tributary of the Guadiana. Its length is 166 kilometres (103 mi). A portion of the river forms the Portugal–Spain border.
38°12′N 7°28′W / 38.200°N 7.467°W