Pebas is situated on a high clay bluff beside the Ambiyacu, a mile above its entrance into the Maranon.
"The Andes and the Amazon" by James Orton
The current of the Amazon at Pebas is 2-1/2 miles per hour; distance from the Atlantic, 2009 miles.
"Life of Rear Admiral John Randolph Tucker" by James Henry Rochelle
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