Taiwan owes its existence to plate tectonics, and nowhere is that debt more evident than in Yushan National Park. The park covers 103,121 hectares of the Central Mountain Range, containing more than thirty peaks above 3,000 meters. The elevation difference within the park spans 3,600 meters - from lowland valleys to the summit of Yu Shan itself at 3,952 meters. Fault lines, joints, and folding are everywhere. Great Precipice shows fossils of ancient marine species. Scree slopes fan out at the foot of the main peak. Fault scarps cut through the landscape between Batongguan and the summit ridge. The Southern Cross-Island Highway and the Yushan Scenic Highway both offer windows into these geological forces, though 'offer' may be generous - some of these roads have been closed for years by the earthquakes and landslides that continue to reshape the mountains.

Three of Taiwan's most important rivers are born in Yushan. The Zhuoshui River, the longest in Taiwan, begins here and flows west to the coast. The Kaoping River drains south toward Kaohsiung. The Siouguluan River runs east to the Pacific. Smaller tributaries - the Chenyoulan, Jyunda, Nanzaisian, Laonong, and Lekuleku - are all young rivers with V-shaped beds, cutting deeper into the mountains with every rainy season. Jinmentong Cliffs, along the Chenyoulan River, formed where the river sliced through a fault line, creating one of the best examples of headway erosion in Taiwan. Yunlong Waterfall and Yinyu Waterfall punctuate the terrain. Alpine lakes like Jiaming Lake and Tienchih collect rain and snowmelt in the shadows of surrounding peaks, fragile ecosystems that sustain both wildlife and hikers in the high country.

The park's 3,600-meter elevation range compresses climate zones that would normally span thousands of kilometers of latitude. Subtropical broadleaf forests blanket the lower slopes, giving way to temperate forests of camphor, oak, and cypress. Higher still, conifers dominate - including the Taiwan cypress, one of the world's most valuable timber species. Above the treeline, alpine meadows host plants found nowhere else: Taiwan edelweiss, high-mountain bellflowers, and cushion plants adapted to freezing winds. The Formosan black bear roams these forests, along with sambar deer, Taiwan macaques, and the Formosan serow. The park is an important nesting ground for the mountain hawk-eagle, one of Taiwan's rarest raptors. With species gradually recovering under the park's protection after years of over-hunting, Yushan is becoming what conservationists hoped: a sanctuary where Taiwan's ecological diversity could rebuild.

Prehistoric stone tools and pottery found in the Wangshiang and Dongpu areas prove humans have lived in these mountains for millennia. The Bunun people, an indigenous Austronesian tribe, migrated from Taiwan's coastal plains to the mountains roughly 300 years ago and still inhabit the villages of Dongpu and Meishan within the park's boundaries. The Tsou people once lived on the park's western side but have been largely assimilated by the Bunun over time. In 1875, during the Qing dynasty, the Batongguan Trail was built through the mountains for military defense purposes, displacing indigenous communities along its route. Stone steps, walls, and guard posts from that era survive in the forest, now maintained as historical relics. The trail remains one of the most challenging and historically significant hiking routes in Taiwan.

Yushan National Park is not among the most visited national parks in Taiwan - and that is partly the point. Entry controls limit the number of hikers on the main trails, and the park's remote location in the center of the island's mountain spine deters casual visitors. Even so, the park attracted over one million visitors in 2015, most of them headed for the summit trail or the scenic viewpoints along the highways. Three visitor centers - Tataka, Nanan, and Meishan - provide orientation, and Paiyun Lodge offers the only overnight accommodation on the summit trail. Bridges and wooden pathways have been installed on the most difficult terrain for safety, but much of the park remains true wilderness - no trails, no facilities, no people. For its exceptional biodiversity, it is considered a potential World Heritage Site.