East of the Andes lies the savanna of the Llanos, part of the Orinoco River basin, and in the far southeast, the jungle of the Amazon rainforest. Together these lowlands comprise over half Colombia's territory, but they contain less than 6% of the population. To the north the Caribbean coast, home to 21.9% of the population and the location of the major port cities of Barranquilla and Cartagena, generally consists of low-lying plains, but it also contains the Sierra Nevada de Santa Marta mountain range, which includes the country's tallest peaks (Pico Cristóbal Colón and Pico Simón Bolívar), and the La Guajira Desert. By contrast the narrow and discontinuous Pacific coastal lowlands, backed by the Serranía de Baudó mountains, are sparsely populated and covered in dense vegetation. The principal Pacific port is Buenaventura.