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Watershed hydrologic units (HU) are generally subdivided into 5 to 15 units. The average size of an 8-digit sub-basin hydrologic unit is about 450,000 acres. The typical 10-digit watershed size is 40,000 to 250,000 acres, while the typical 12-digit subwatershed is 10,000 to 40,000 acres. 8- and 10-digit watersheds can be derived from 12-digit watershed shapefiles.
The Amazon basin (the watershed of the Amazon River) is 7,050,000 km2 in area (or about 2,500,000 miles2), and covers about 40% of South America. Of this area, approximately 5,000,000 km2 is (or was) covered by high tropical rainforest, with the remainder covered by savannah (campo) or scrubby woodland (cerrado).he Amazon basin covers significant portions of the countries of Brazil, Peru, Colombia, Ecuador, Venezuela and Bolivia, though the major part of the watershed lies within Brazil. The next largest tropical watershed, that of the Congo River, at 3,690,000 km2, is only half the size of the Amazon basin.