The department was divided into three subregions based on geographical characteristics: Upper, Middle, and Southern Guajira. The Upper Guajira covers the northernmost part of the peninsula, with mostly scarce semi-desertic vegetation. It has only an isolated, low-altitude mountain range, the Serranía de Macuira (865 m above sea level). The Middle Guajira region is mostly flat, with hills in some areas, presenting also an arid environment. The Southern Guajira covers the region of the Montes de Oca and the Serranía del Perijá mountain ranges on the border with Venezuela, and the valley formed with the Sierra Nevada de Santa Marta mountain range. Southern Guajira has more green vegetation, wetlands and rivers.