Stranger in the Forest by Eric Hansen
Stranger in the forest (subtitle: on foot across Borneo) is a 1988 book by Eric Hansen about a seven months and 4000 km long journey (of which 2300 km on foot) through the heartland of Borneo in 1982. Hansen was the first westerner to walk across the island. He did so largely with the aid of local Penan, who took him away from the rivers, the most used transportation routes in Borneo, to walk through the forest. The journey started in Marudi in Sarawak, Malaysia, at the northwest coast of the island. When, after an illegal border-crossing, he eventually emerged near the east coast in Kalimantan, Indonesia, the confrontation with western civilisation gave him such a culture shock that he turned around for another crossing of the island, during the 'season of fear'.