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In page Purus River:

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William Chandless found its elevation above sea level to be only 107 feet (33 m) 590 miles (950 km) from its mouth. It is one of the most crooked streams in the world, and its length in a straight line is less than half of its length following its curves. It is practically only a drainage ditch for the half-submerged, lake-flooded district it crosses.[citation needed] Its width is very uniform for 1,000 miles (1,600 km) up, and for 800 miles (1,300 km) its depth is never less than 45 feet (14 m).[citation needed]