Ngọc Linh straddles the border between Quảng Nam Province and Kon Tum Province in Vietnam's Central Highlands, rising from a range that forms the backbone of the Indochinese Peninsula. The Annamite Range here runs roughly north-south, its eastern slopes dropping toward the coastal lowlands and the South China Sea, its western flanks descending into the drier river valleys that drain toward the Mekong. The mountain is classified as an 'ultra-prominent peak' — meaning its summit is separated from any higher terrain by a significant drop, giving it a distinct and dominant presence in the landscape. On clear days the peak is visible from considerable distances in all directions, a reference point for everyone who has ever moved through this part of the highlands, from ancient traders to wartime soldiers to modern trekkers.

In 1973, botanists formally identified a species of ginseng found growing on and around Ngọc Linh that matched no previously described plant: Panax vietnamensis, Vietnamese ginseng. It is native exclusively to the South Central Coast and Central Highlands of Vietnam, and it is especially abundant on the mountain's upper slopes. Among the ginseng species — a genus that includes some of the most highly valued medicinal plants in the world — Panax vietnamensis is notable for its exceptionally high concentration of active compounds. For the Xơ Đăng and other highland communities who have harvested it for generations, it has always been more than a trade commodity. It is bound up with the mountain itself, with the altitude and the cloud forest conditions that no lowland cultivation has fully replicated. The mountain's protection is, in a practical sense, the ginseng's protection.

The mountain's biological surprises extend to its smaller inhabitants. The slopes of Ngọc Linh are the only known habitat of two species of tree frog that were unknown to science until recent decades: Gracixalus lumarius, the thorny tree frog, and the closely related Gracixalus trieng, the Trieng tree frog. Both belong to a genus found across Southeast Asia, but these two species live only here, on this mountain, in these forests. Their existence is a reminder of how much ecological distinctiveness can persist in a mountain landscape that was — for most of recent history — extremely difficult for outsiders to access. The Central Highlands of Vietnam remained heavily forested through periods when lowland areas were dramatically transformed, which may explain why Ngọc Linh has held onto species that exist nowhere else.

The Jeh-Tariang people — an Austroasiatic-speaking community of the highlands — named this mountain before any outside authority had reason to record it. Their name, Ngơk kariàng, passed into wider usage through the complicated layers of Vietnamese linguistic history, arriving eventually as the Sino-Vietnamese Ngọc Linh, 'Jade Mountain,' a name that carries different connotations but points toward the same peak. The history of this naming sequence is a small illustration of a larger truth about the highlands: the communities who lived here first knew the landscape with a precision that later arrivals often had to rediscover. The mountain's flora and fauna, its altitude, its microclimates — all of it was understood at a practical level long before scientific classification caught up. What science is still cataloguing, the Jeh-Tariang and their neighbors have lived alongside for centuries.