Kota Kinabalu
Located in Borneo, an island in Malaysia, Kota Kinabalu offers trekkers the ability to hike to the highest peak in Borneo. Despite the achievement on this UNESCO World Heritage Site, it’s still one of the most treacherous hikes in the world. It has diverse flora and fauna and is a very difficult hike that requires a lot of skill from hikers, who must be in good shape. At the top, you can even climb a vertical wall while attached to a steel cable (Book A Trekking)