The area was historically a hub for hydraulic power development, evidenced by the old canal structures remaining in the valley.
The distinct emerald green color of the water is caused by the high mineral content, specifically calcium carbonate, sourced from the surrounding marble deposits.
The river valley is part of the Mugua River power project area, which historically utilized the water flow for hydroelectric generation.
The valley served as a secret, less-traveled alternative to Taroko Gorge for decades before social media exposure increased foot traffic.
The rocks lining the riverbed are largely composed of metamorphic limestone, which creates the smooth, white texture seen along the water's edge.
Emerald Valley is a natural site in Xiulin Township, Hualien County, characterized by a series of deep, turquoise-colored pools formed by the Mugua River. The area is accessed via a trail that passes through a historic tunnel carved directly into the rock face. The riverbed is composed of smooth, marble-rich geological formations. Visitors can swim in designated sections of the river, which remain cold throughout the summer. The valley is tucked within a narrow canyon that features lush, subtropical vegetation and steep mountain walls. It is a distinct ecosystem from the more commercialized Taroko Gorge area nearby. The water quality is exceptionally clear due to the upstream filtration through rock strata.
From the center of the iron-grated bridge overlooking the deepest section of the emerald pool.
Wear water shoes with good grip, as the marble riverbed can be extremely slippery when wet.
Bring a waterproof bag for electronics, as humidity and splashing are unavoidable near the pools.
Arrive early in the morning to beat the humidity and secure a spot in the primary swimming pool.
Attempting to climb the steep, unmaintained canyon walls for 'better views' is dangerous and increases erosion.
The area may be temporarily closed following typhoons or heavy rainfall due to the risk of rockfalls and rapid water surges.
Pack out all trash and avoid using chemical sunscreens that contaminate the pristine water.
