Juliaca is the capital of San Román Province in the Puno Region of southeastern Peru. It is the region's largest city with a population of 276,110 inhabitants (2017). On the Altiplano, Juliaca is 3,825 metres (12,549 ft) above sea level, is located on the Collao Plateau and is northwest of Lake Titicaca (45 km). It is the largest trade center in the Puno region.