Bukit Jernih, which translates to "Clear Hill," is named after the remarkably clear stream that flows at its base. Historically a quiet agricultural area, it rose to fame as a premier "hidden gem" for ecotourism and camping in Northern Malaysia. The hill is part of the Chuping Formation, a limestone sequence that dates back hundreds of millions of years to the Permian era. The site is most famous today for the Bukit Jernih Geocamp, a site that allows visitors to camp directly at the foot of the ancient cliffs. It has gained international attention among "overlanders" and nature photographers who come to witness the "Perlis Mirror" phenomenon—where the still water in the rice paddies creates a perfect symmetrical reflection of the karst hills, a scene often compared to the countryside of Guilin, China, or the Swiss Alps.