The northern white-cheeked gibbon (Nomascus leucogenys) is a species of gibbon native to Southeast Asia. Here’s a description of its distribution by country:

1. China: Northern white-cheeked gibbons are found in certain parts of China, particularly in the southwestern province of Yunnan. They inhabit tropical and subtropical forests in this region.
2. Laos: Northern white-cheeked gibbons are native to Laos, where they are found in various forested areas across the country. They inhabit both lowland and montane forests.
3. Vietnam: Northern white-cheeked gibbons are also found in Vietnam, particularly in the northern and central parts of the country. They inhabit forests in the Annamite Range along the border with Laos.

Northern white-cheeked gibbons are arboreal primates known for their acrobatic abilities and distinctive calls. They have long arms and legs adapted for swinging through the forest canopy. These gibbons typically live in small family groups consisting of a mated pair and their offspring. They are primarily herbivorous, feeding on fruits, leaves, and other plant materials.

Despite being native to several countries in Southeast Asia, northern white-cheeked gibbons face threats from habitat loss, deforestation, and hunting. Conservation efforts are underway to protect remaining populations and their habitats, including the establishment of protected areas and conservation initiatives aimed at reducing human-wildlife conflicts.