Geography of South America world by drainage area—the Amazon River and the more southerly Paraná River. The other major river of this central lowland is the Orinoco River, which has a natural channel linking it with the Amazon. Most of this central lowland is sparsely populated because the soils are heavily leached, but in the south is the very fertile pampas of Argentina—one of the world's major food-producing regions where wheat and beef cattle are pre-eminent. The natural vegetation of the northern lowlands are either savanna in the northern "llanos" and southern "campos", or tropical rainforest throughout most of the Amazon basin. Efforts to
Central Lowlands Rhins of Galloway in the west towards Dunbar on the east coast from Edinburgh. A productive combination of fertile low-lying agricultural land and significant deposits of economically valuable coal and iron have led to the Central Lowlands being much more densely populated than the rest of Scotland. The major cities of Glasgow, Edinburgh, Stirling and Dundee all lie in the Central Lowlands, and over half of Scotland's population lives in this region. Central Lowlands The Central Lowlands or Midland Valley is a geologically defined area of relatively low-lying land in southern Scotland. It consists of a rift valley between the