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If size is important to you... The average discharge of water into the Atlantic Ocean by the Amazon is approximately 175,000 m3 per second, or between 1/5th and 1/6th of the total discharge into the oceans of all of the world's rivers!
The seasonal variation in water levels means that huge areas along the major rivers in the Amazon basin are flooded annually. The total area of flooded, or varzea, forest is between 50-60,000 km2, or about 4% of the total area of the Amazon rainforest.