Some of Southeast Asia’s most breathtaking landscapes can be found underground. Large sections of the region possess a karst (limestone) geology that serves as a perfect canvas for cave formation.
Parts of Vietnam, Malaysia, the Philippines and Thailand possess these in abundance: massive cave chambers, stalactites glimmering with moisture, and underground rivers that will stun even the most experienced spelunker.
The other side of the altitude adventure coin takes you vertically up mountainsides. Experienced wall-climbers will find plenty of material to work with in Southeast Asia, from the karst cliff faces in Krabi, Thailand to the granite heights of Sarawak and Selangor.
Whatever adventure you seek - down in the dark or up in the heights - one of the adventures listed below is waiting for you.