The northern mountains are the extreme northeastern extensions of South America's Andes mountain range. Pico Bolívar, the nation's highest point at , lies in this region. To the south, the dissected Guiana Highlands contain the northern fringes of the Amazon Basin and Angel Falls, the world's highest waterfall, as well as "tepuis", large table-like mountains. The country's center is characterized by the "llanos", which are extensive plains that stretch from the Colombian border in the far west to the Orinoco River delta in the east. The Orinoco, with its rich alluvial soils, binds the largest and most important river system of the country; it originates in one of the largest watersheds in Latin America. The Caroní and the Apure are other major rivers.