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Amazonia (original 2002; edition 2003)
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Wikipedia in English
Amazon.com Product Description (ISBN 0060002492, Mass Market Paperback)The Rand scientific expedition entered the lush wilderness of the Amazon and never returned. Years later, one of its members has stumbled out of the world's most inhospitable rainforest--a former Special Forces soldier, scarred, mutilated, terrified, and mere hours from death, who went in with one arm missing . . . and came out with both intact.
Unable to comprehend this inexplicable event, the government sends Nathan Rand into this impenetrable secret world of undreamed-of perils, to follow the trail of his vanished father . . . toward mysteries that must be solved at any cost. But the nightmare that is awaiting Nate and his team of scientists and seasoned U.S. Rangers dwarfs any danger they anticipated . . . an ancient, unspoken terror--a power beyond human imagining--that can forever alter the world beyond the dark, lethal confines of . . .
(retrieved from Amazon Mon, 30 Sep 2013 13:53:25 -0400)
A former special forces soldier who was part of a missing expedition to the Amazon returns with only hours to live, inexplicably possessing two arms where he only had one. Nnathan Rand leads a new team to discover the truth, finding an ancient power beyond human imagining.
(summary from another edition)