Discovering the Wild World of Son Tra: Where the Red-shanked Douc Langur Rules the Green Forest

The red-shanked douc langur, also known as the five-colored langur or red-shanked douc, is a primate endemic to the Indochina region (mainly Vietnam, Laos, and Cambodia). This species is listed as Endangered in the Vietnam Red Data Book and the IUCN Red List, featuring striking "five-colored" fur:

• Black crown, jet-black shoulders and arms.
• Vibrant orange-yellow face, with orange trim on the chest and groin.
• Ash-gray body, characteristic reddish-brown lower legs (giving rise to the name "red-shanked").
• White fur on the rump and tail.

They live in small troops (4–20 individuals), active during the day, mainly high in the canopy (arboreal). Their diet consists of young leaves, buds, fruits, and flowers – a typical folivore that helps maintain the forest ecosystem's balance through indirect seed dispersal. In Son Tra, the red-shanked douc langur has been documented since 1969. According to the latest research by GreenViet Biodiversity Conservation Center, the peninsula is currently home to more than 1,300 individuals, representing the largest population in the world. They are widely distributed across 4,439 hectares of forest, from mountain peaks to the coast, demonstrating vibrant vitality in a near-pristine environment.

Son Tra possesses a unique coastal tropical evergreen seasonal rainforest ecosystem rare in Vietnam. With more than 1,360 plant species (including many abundant sources of young leaves and fruits such as Ironwood, Madhuca pasquieri, and Parashorea chinensis), the peninsula provides a rich year-round "feast" for the langurs.

The cool climate (thanks to elevations reaching up to 696m at Ban Co Peak), with minimal disturbance compared to other Truong Son forests, helps the langur population develop sustainably. Son Tra forest also serves as a "shield" against wind and storms, maintaining high humidity and rich biodiversity, creating ideal conditions for this shy primate species to breed and expand its troops. Compared to other areas (such as Phong Nha – Ke Bang National Park or Bac Huong Hoa), Son Tra has the highest langur density thanks to early and strict protection efforts. This is not just a shelter but a true "kingdom", where the red-shanked douc langur is dubbed the "queen of the green forest".

Son Tra is not only famous for the red-shanked douc langur, but is also one of Vietnam's most biologically diverse nature reserves. According to biological studies, the area records over 528 animal species, including many characteristic species of the tropical forest ecosystem such as pig-tailed macaques, muntjacs, squirrels, and hundreds of bird species living across different forest strata. The peninsula's primeval forest ecosystem harmoniously blends with a coastline of about 60 km, colorful coral reefs, and pristine beaches, creating a rare multi-layered natural landscape.

In the eyes of international tourists, Son Tra is often referred to as "Monkey Mountain", stemming from the presence of numerous primate species, particularly the red-shanked douc langur. Only about 10 km from Da Nang city center, visitors can easily reach this wild natural environment with many exciting experiences such as light forest trekking, watching the sunrise at Ban Co Peak, snorkeling to view coral, or strolling along forest-edge roads.

In every season of the year, Son Tra dons its own unique beauty. In March and April, yellow flame tree blossoms bloom brightly across the hillsides, while fresh young tree foliage attracts langur troops to lower canopy areas to forage, creating ideal conditions for wildlife watching. During the dry season, the peninsula is often shrouded in light mist, presenting a magical and tranquil setting. It is the combination of untouched nature, a diverse ecosystem, and unique landscapes that makes Son Tra an ideal place to explore and better appreciate the value of Vietnam's biodiversity.

The red-shanked douc langur is widely distributed across the Son Tra Peninsula; however, certain areas are considered observation "hotspots" with higher sighting rates due to favorable habitat conditions and abundant food sources.

• Route to Tien Sa Lighthouse: The easiest area to spot them. Along both sides of the road are many wide-canopy trees with abundant young leaves. In the early morning or late afternoon, the langurs often come down to feed; just drive slowly and watch carefully to see troops swinging through the branches.
• Ban Co Peak and surrounding roads: At an elevation of 696m, mist often covers the area, creating a dreamy backdrop. Langurs frequently appear around scenic viewpoints.
• Thousand-Year Banyan Tree area: The massive canopy of the ancient banyan tree provides an abundant food source, especially from February to April.

Tip: March to May is when newborn langurs arrive, making troops quite active. The ideal viewing times are from 4:00 AM – 10:00 AM and 2:00 PM – 4:00 PM, when langurs are active and foraging. Drive slowly, turn off the engine when spotting langurs, and maintain a minimum distance of 15–20 meters.

To make your exploration of Son Tra Peninsula both enjoyable and ecologically responsible, visitors should observe several important principles to protect the ecosystem and minimize impacts on wildlife, especially the red-shanked douc langur.

• Transportation: Rent a motorbike/car from central Da Nang (via Hoang Sa or Yet Kieu street). Join a guided eco-tour to increase your chances of sightings and gain deeper insights.
• Timing: Avoid the rainy season (September–December); prioritize early morning/late afternoon. Opening hours: 7:30 AM – 7:00 PM (some areas close earlier).
• Observing langurs: Maintain absolute silence; do not shout, use flash photography, or feed them. Keep your distance, watch from your vehicle, or stand still. Langurs are shy and easily frightened away if disturbed.
• General Safety: Do not litter, break branches, or interact closely with pig-tailed macaques (which can be aggressive). Bring water, sunscreen, and wear comfortable shoes.

Exploring Son Tra is not merely a sightseeing or photography trip, but also an opportunity to gain a deeper understanding of nature's value and conservation responsibilities. It is home to the world's largest population of red-shanked douc langurs, serving as a testament to the rare balance between humans and the natural environment. If you want to fully experience the beauty of the forest and sea, consider joining all-inclusive Son Tra eco-tours. These programs not only help you observe langurs safely, trek through the jungle, and snorkel among corals, but also contribute to protecting the 'queen of primates' and Da Nang's precious ecosystem.