The Peruvian government has sought to open a trade route between the [Rio Ucayali]? and the rich rubber districts of the Mayutata?. All of the upper branches of the river Madeira find their way to the falls across the open, almost level Mojos? and Beni? plains, 90,000 km2 (35,000 square miles) of which are yearly flooded to an average depth of about 3 feet for a period of from three to four months. They rival if they do not exceed in fertility the valley of the Nile, and are the healthiest and most inviting agricultural and grazing region of the basin of the
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