Eight Hundred Leagues on the Amazon by Jules Verne (1828 - 1905)

First published in 1881, Eight Hundred Miles on the Amazon is an adventure novel by Jules Verne, having elements of codes and cryptography. Unlike many of his other stories, it is not a work of science fiction. Rather, it describes a voyage down the Amazon River on a large raft, or jangada). Many aspects of the raft, scenery, and journey are described in detail. - Summary by not.a.moose, adapted from Wikipedia.