Borneo

All Elevations Unknown: An Adventure in the Heart of Borneo, by Sam Lightner, Jr. (2001). Rock-climbing enthusiast Lightner is determined to find and climb an uncharted peak in Borneo that is referenced in World Within, a 1958 travelogue written by WWII British officer Tom Harrison. With intuition based on Kelabit legend, and a map labeled "all elevations unknown," Lightner and German-climbing partner Volker trek deep into Borneo jungles in search of this legendary peak.

*Stranger in the Forest: On Foot Across Borneo, by Eric Hansen (1988). Hansen is like a brainy little brother. His audacious spin through the dwindling forests of Borneo (with no visa, no passport, and severely limited local vocabulary) was fueled entirely by his resilience, humor, and friends made along the way, some of whom had never been beyond the fringes of the forest.