Duration: 17 Days/16 Nights Grade: Challenging Experience the ultimate challenge by traversing one of the most rugged islands in the world from the west to east crossing jungles, hills, mountain, rivers, rapids, and wilderness. We will be trekking to the lush of Borneo jungle with diversity of vegetation and animal wildlife. This challenging expedition is retracing a historical expedition of a Dutch botanist, DR. Anton W. Niewenhius in 1894, as well as exploring the site where first expedition