The Irrawaddy dolphin (Orcaella brevirostris) is a rare and remarkable freshwater dolphin, famous in Kratie Province for inhabiting a particularly scenic stretch of the Mekong River. Unlike most of their ocean-dwelling relatives, these dolphins are uniquely adaptable, thriving in both marine and freshwater environments. In fact, they are one of only three whale and dolphin species in the world known to occupy both habitats, making encounters with them in Kratie especially extraordinary.

Appearance of the Irrawaddy Dolphin

The Irrawaddy dolphin is small, shy, and distinctively different from the sleek, acrobatic image many people associate with dolphins. It has a rounded head, a small curved dorsal fin, and a dark gray body with a lighter underside. Adults can grow up to 2.75 meters in length and weigh as much as 150 kilograms. They usually travel in small groups of two to six individuals and surface in gentle, arching movements rather than dramatic leaps, which adds to their elusive charm.

Habitat & Distribution

The Irrawaddy dolphin is found in both coastal and inland waters:

Marine populations

These dolphins are commonly found along coasts, often in brackish or muddy waters where rivers meet the sea. They tend to stay near estuaries and shallow coastal areas, feeding on fish and small invertebrates. The largest known population around 6,000 individuals resides off the coast of Bangladesh, making it an important stronghold for the species.

Freshwater populations

Freshwater Irrawaddy dolphins are extremely rare and critically endangered, with fewer than 100 individuals in each of the five known river and lake populations worldwide. They are highly sensitive to changes in water quality, fishing pressures, and habitat disruption, which makes conservation efforts vital for their survival.

In Cambodia, the most famous group of about 15–20 dolphins lives along the Mekong near Kampi. Here, deep pools of water and nearby rapids provide a safe refuge, allowing the dolphins to thrive despite human activity along the river. Conservation programs and eco-tourism initiatives have helped raise awareness about these unique creatures and the importance of protecting their fragile habitats.

Behavior & Activity

The Irrawaddy dolphin is quiet and discreet. Unlike ocean dolphins, it rarely leaps out of the water, preferring to surface smoothly and silently. They are most active at sunrise and in the late afternoon, when the Mekong glows with soft light, making these the best times for sightings.

Conservation Status

Irrawaddy dolphins are classified as Critically Endangered on the IUCN Red List. Their numbers have been severely reduced by threats such as entanglement in fishing nets, habitat degradation, and historical hunting. 

Today, however, focused conservation projects in Kratie, supported by both local communities and international organizations are working to protect the dolphins, raise awareness, and promote eco-tourism as an alternative livelihood.

Cultural & Ecological Significance

In Khmer culture, the Irrawaddy dolphins are revered as symbols of good fortune and spiritual guardians of the Mekong. Beyond their cultural value, they also serve as ambassadors for conservation and eco-tourism. 

Visitors from around the world travel to Kratie to see them in the wild, and their presence helps generate sustainable income for local communities, while reinforcing the need to safeguard Cambodia’s natural heritage.