The Mekong Delta is one of the largest on Earth. Formed over the last 8000 years, it fans out and discharges into the South China Sea via nine channels. These channels split and shape the coastline, creating unique habitats for a variety of animals. The western side of the delta boasts a spectacular limestone landscape; spires with razor sharp crests and lofty pinnacles line the coast. The region is home to a large troop of rare Indochinese silvered langurs. Their silvery fur is easy to spot as they move through the leafy trees. Their long sweeping tails help them balance as they negotiate steep limestone formations. Their diet consists of 90% leaves, more than any other monkey. Their stomachs are more similar to ruminants than other primates, allowing them to digest tough leaves. It's peak birthing season, and langur babies are hard to miss, born bright orange to allow for parents to keep track of them in their treetop habitat. Other females will cooperate in parenting duties while mothers get some rest. Langurs are very social primates and as night approaches the entire group will retreat to shelter together in a single tree. Many other species are specialized for this harsh karst environment. Fig trees have evolved striking root systems that allow them to anchor themselves on steep cliff faces. The roots also release acid that dissolves the limestone allowing them to penetrate rock and access water and minerals. Nestled within the limestone karsts are a series of Buddhas. Karst hills are considered sacred places that play a significant role in the spiritual life of indigenous people, especially Buddhists. The local respect for these hills may be the reason why the wildlife here is so abundant. At the foot of these enigmatic limestone hills lie dynamic beach ecosystems. Chaotic worlds ruled by crabs of all shapes and sizes. Up close we see thousands of almost perfect spherical balls of sand surrounding deep burrows. Sand crabs work very hard to construct their homes. They must discard each ball of sand away from the entrance and return before another crab steals their burrow. Competition is fierce and fights are regular. The Mekong has an effect that extends beyond Vietnam's coastline and into the marine ecosystem. As the river's nine channels expel nutrients into the South China sea, they disperse minerals along the coast. In the right concentrations, these minerals are a food source for plankton, the foundation of the marine ecosystem. The coral reefs off the coast here are home to a wealth of marine biodiversity; from colourful invertebrates to turtles, whale sharks and cuttlefish.