Andean mountain range, northern Colombia, bounded on the north by the Caribbean Sea and encircled on three sides by the coastal lowlands. The volcanic massif rises abruptly from the coast, culminating in snowcapped Pico (peak) Cristóbal Colón (18,947 ft 【5,775 m】 above sea level), the highest peak in Colombia. The lower slopes are used for agriculture and livestock raising, but the region is not well developed. The local population includes Arawak Indians. Santa Marta, to the northwest, and Valledupar, to the southeast, are the nearest cities.