Zhangjiajie National Forest Park

Zhangjiajie's sandstone pillar landscape looks geologically impossible, which is precisely the problem with first impressions. The pillars are steep-sided, almost vertical, rising hundreds of metres from the valley floor with subtropical vegetation growing on every available surface, including vertical cliff faces that appear to have no soil. The visual effect — this proliferation of green towers dissolving into low cloud and mist — is unlike any other major landscape in China and has driven the geological explanation that the park has been most associated with since Western scientists began visiting in the 1980s and found that their existing vocabulary for describing landscapes did not quite apply.

The geological history involves roughly 300 million years of marine sediment accumulation followed by uplift and approximately 70 million years of differential weathering. The pillars are the result of vertical jointing in the quartz sandstone — natural fractures running vertically through the rock — that has been preferentially eroded along those joint planes by rainfall and chemical weathering, leaving the more resistant rock columns standing. The weathering has been selective and directional, which is why the pillars have their characteristic slightly irregular outlines rather than being perfectly cylindrical. The result is a landscape that looks almost artificial in its precision, as if the erosion was supervised by an architect rather than driven by water and chemistry alone.

The atmospheric conditions are not incidental to the experience but constitutive of it. Zhangjiajie receives approximately 1,800 millimetres of rainfall annually — comparable to some tropical rainforests — and is frequently enveloped in cloud and mist, particularly in the morning hours. Individual pillars emerge from and disappear into mist in ways that make the same view fundamentally different every hour, and in heavy fog, which is common in autumn and winter mornings, the pillars become isolated islands in a white sea, their bases invisible and their tops truncated by cloud. This instability of the visible landscape is not a disappointment — it is what the experience is.

The park is large and is divided into four main operating areas connected by shuttle buses, cable cars and a scenic valley road. Most visitors concentrate on the central Wulingyuan area, which contains the most famous pillar formations and the Hallelujah Mountains viewpoint that most people have seen in photographs. The Grand Canyon area contains the famous glass-bottomed bridge, a structure that has become one of the most photographed single constructions in China and whose relationship to the landscape is more contentious among serious visitors than the bridge's popularity would suggest. The other two areas, Thousand Great Peaks and Yangjiajie, are less visited and less developed.

The summit overnight is unlike the daytime visit in a way that it is difficult to anticipate. When the last shuttle bus has departed and the day-trippers have returned to Zhangjiajie City below, the mountain areas above the valley road are genuinely quiet. The fog patterns change through the evening as the air temperature drops and rises, the sounds of the valley come up through the mist as a low continuous murmur, and in the early morning before the first buses arrive, the landscape has a quality of stillness and scale that the crowded afternoon experience makes very difficult to imagine. The mist closes in around the pillar tops, the valleys fill with white, and the effect on the individual pillar formations is to make them seem to float.

Zhangjiajie is the type example for quartz sandstone pillar landscape formations used by geomorphologists worldwide and the primary visual inspiration for the Hallelujah Mountains in Avatar.

The park provides access to one of the most visually distinctive natural landscapes on earth, with genuine geological complexity beneath its photogenic surface.

The summit overnight — when the day crowds have left and the mist patterns change through the night — is a genuinely different experience from the daytime tourist visit.