Streams and poplar groves of Cubas de la Sagra Nature · Cubas de la Sagra, Comarca Sur, Madrid Image of Cubas de la Sagra, not of the place itself. Barely three streams run across its twelve square kilometres, the Arboleda, the Prado and the Valdeano, but the groundwater sustains stands of black and white poplar and willow; red-legged partridge, hoopoe and little owl show themselves in the fields. Photo: Dirección General de Turismo. Consejería de Economía e Innovación Tecnológica. Comunidad de Madrid (CC BY 3.0 es) What to see and do in Cubas de la Sagra