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In page South America:

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The Brazilian Highlands have a much higher hydroelectric potential than the Andean region[citation needed] and its possibilities of exploitation are greater due to the existence of several large rivers with high margins and the occurrence of great differences forming huge cataracts, such as those of Paulo Afonso, Iguaçu and others. The Amazon River system has about 13,000 km of waterways, but its possibilities for hydroelectric use are still unknown.