It extends from west-northwest to east-southeast and covers an area of about 142,000 square metres (1,530,000 sq ft). The Alhambra's most westerly feature is the alcazaba (citadel), a strongly fortified position. The rest of the plateau comprises a number of Moorish palaces, enclosed by a fortified wall, with thirteen towers, some defensive and some providing vistas for the inhabitants. The river Darro passes through a ravine on the north and divides the plateau from the Albaicín district of Granada. Similarly, the Assabica valley, containing the Alhambra Park on the west and south, and, beyond this valley, the almost parallel ridge of Monte Mauror, separate it from the Antequeruela district. Another ravine separates it from the Generalife.