Jum Island, also known as Pu (Crab) Island is located approximately 25 kilometers south of Krabi (Thailand) on the Andaman Sea. The mountainous northern part (known as Koh Pu) is rugged, rocky, filled with small rubber plantations and what looks to me like triple-canopy jungle on the upper slopes of Mt. Pu (395 m. high) while the southern part (Koh Jum) is relatively flat and covered by the natural vegetation of the Andaman Coast, casuarinas trees and screw palms.