Pacific South America stretches along the Pacific Ocean from the equator to the Arctic Circle. It contains several countries with high Andes Mountains that experience frequent earthquakes and volcanic eruptions. Climate and vegetation vary widely by elevation, from tropical rainforests to cold deserts. Early cultures like the Incas built extensive empires before the arrival of Spanish conquistadors. Today, the region contains diverse countries with varying levels of development, democratic governments, and economies based on natural resources like minerals, oil, and agriculture.