Gangetic River Dolphin in Nepal

The Gangetic river dolphin (Platanista gangetica) is one of Nepal's rarest and most extraordinary animals — a near-blind freshwater dolphin that navigates the murky lowland rivers by sound alone. Surviving in only a handful of river stretches, it is among the country's most threatened mammals and a powerful symbol of river health in the Terai.

Description

The Gangetic dolphin is a stocky, grey-brown freshwater dolphin with a long, narrow beak lined with sharp teeth, a low ridge instead of a true dorsal fin, and tiny, almost useless eyes. Adapted to silty, low-visibility water, it relies on echolocation, emitting clicks to find fish and obstacles. It often swims on its side and surfaces only briefly to breathe, making it easy to miss.

Where to see it in Nepal

The dolphin clings on in a few lowland rivers. The best-known strongholds are the Karnali river near Bardia National Park in the far west, and the Koshi river around Koshi Tappu Wildlife Reserve in the east. Boat trips on these rivers offer the best chance, though sightings are typically a brief glimpse of a surfacing back or beak. For trip planning, see the Bardia destination hub.

Conservation status

The Gangetic river dolphin is listed as Endangered on the IUCN Red List, and Nepal's population is tiny and fragmented. The chief threats are dams and barrages that block movement and alter river flow, water diversion for irrigation, pollution, declining fish stocks and accidental drowning in fishing nets. Maintaining river connectivity, controlling pollution and engaging fishing communities are central to its survival.

Best rivers and season

Head for the Karnali at Bardia or the Koshi at Koshi Tappu during the dry season (October to April), when lower, clearer water concentrates dolphins in deeper pools and makes boat trips more rewarding. Even then, encounters are fleeting and far from guaranteed, so pair a dolphin-watching trip with other Terai wildlife and treat any sighting of this rare river mammal as a real stroke of luck.

Behaviour and ecology

Having evolved in rivers so silty that eyesight is almost useless, the Gangetic dolphin "sees" with sound, producing a constant stream of clicks and listening for the echoes to build a picture of its surroundings and locate prey. It eats fish and crustaceans, often probing the riverbed with its long beak, and a distinctive habit of swimming on one side may help it feel along the bottom. As a top predator it sits at the apex of the river food chain, so its presence is a strong sign of a healthy, well-connected river. Dolphins are usually seen alone or in small, loose groups, surfacing only briefly to breathe before slipping back under. Because they cannot pass dams or barrages, their populations become trapped in isolated stretches, which makes free-flowing rivers essential to their long-term survival.

Viewing notes

Use licensed local boat operators, scan deep, slow-moving river bends patiently, and keep quiet to avoid disturbing the animals. Surfacings are quick, so watch the water steadily rather than expecting a dramatic leap. Support clean-river initiatives and avoid any activity that adds pollution or net pressure to these fragile waterways.

The dolphin shares Nepal's Terai rivers with the gharial crocodile and the wallowing one-horned rhino, while high above in the mountains lives the Himalayan monal. Explore the full wildlife of Nepal collection and the national parks and wildlife overview.