Rio de Oro was one of the two territories of Western Sahara, when the territory was under Spanish rule. Rio de Oro, which literally means "river of gold" is more to the south. The other part was called Saguia el Hamra. The territory is named after a wadi. The capital of the territory is called Dakhla. When the territory was ruled by the Spanish, its name was "Villa Cisneros". It has a size of roughly . To the north, the 26th parallel is the border, and to the south, the territory is limited by the 21° 20' parallel (and the border with Mauritania).