The river

"Because of his success surviving alone in the wilderness for fifty-four days, fifteen-year-old Brian, profoundly changed by his time in the wild, is asked to undergo a similar experience to help scientists learn more about the psychology of survival. Sequel to "Hatchet.""@en
"On his way to visit his recently divorced father, Brian Robeson is the only survivor of a plane crash in the Canadian wilderness."@en
"The sequel to Hatchet, The River pits a boy against nature for the second time in his life. When a freak storm leaves his companion grievously injured, Brian Robeson is on his own with only his wits to pull him through."
"Unabridged."@en
"Because of his success surviving alone in the wilderness for fifty-four days, fifteen-year-old Brian, profoundly changed by his time in the wild, is asked to undergo a similar experience to help scientists learn more about the psychology of survival."
"Because of his success surviving alone in the wilderness for fifty-four days, fifteen-year-old Brian, profoundly changed by his time in the wild, is asked to undergo a similar experience to help scientists learn more about the psychology of survival."@en