Salva had faced many challenges when leaving Sudan. The main challenges he faces is the challenge of nature. Nature has a huge impact on what happens in the book and has a huge impact on his friendships as well. Because of nature Salva faces the insane heat and temperature of the desert he treks through. When his friend Marial gets killed it was because he was killed by a lion which is a part of nature. He gets very lugubrious because of his friends death. He also faces the challenge of mosquitoes and annoying bugs. These bite him in many spots which challenges him. In conclusion he faces many challenges presented mainly by nature.
Salva had to face these challenges with perseverance and mental and physical toughness.