The lake's near-perfect oval shape led to initial scientific debates regarding whether it was formed by glacial activity or an ancient meteorite impact.
Geological research suggests the lake is a sinkhole formed by chemical weathering of the underlying rock rather than impact or glaciation.
It is the highest lake in Taiwan that is filled naturally by precipitation and groundwater without a perennial stream inflow.
The local Bunun people refer to the lake as 'Cidanumas Buan,' which translates to 'Mirror of the Moon.'
The area is a frequent sighting location for the Formosan Sambar deer, particularly during dawn and dusk.
The lake temperature remains consistently cold, often near freezing during winter months.
It is situated along the Jiaming Lake National Trail, which is one of the most popular high-altitude hiking routes in Taiwan.
Jiaming Lake is a high-altitude alpine lake situated at 3,310 meters above sea level within the Central Mountain Range of Taiwan. Known as the 'Angel's Tear,' it is the second-highest mountain lake in the country. The lake basin is a near-perfect oval depression formed by geological processes. It is accessible only via a multi-day high-altitude trek through the Yushan National Park buffer zone. The site requires specialized mountain entry and national park permits for access. The surrounding terrain consists of alpine grasslands and Yushan juniper forests. It serves as a critical water source for local wildlife, including the Formosan Sambar deer. The water level fluctuates significantly based on seasonal precipitation. It remains one of the most remote and strictly regulated natural landscapes in Taitung County.
The ridgeline of Sancha Mountain offers a complete elevated panoramic view of the lake's oval shape.
Acclimatize to high altitude for at least two days before attempting the trek to prevent mountain sickness.
Carry a high-quality water filtration system, as there are no reliable potable water sources at the lake shore.
Prepare for rapid weather changes and extreme temperature drops, even during summer months.
Attempting the trek without proper physical training, high-altitude gear, or the mandatory park permits.
The trail is subject to closure during extreme weather, including typhoons or winter snow conditions; permits must be applied for in advance.
Strict 'Leave No Trace' policy; all waste must be carried out. Do not touch the water or disturb local wildlife.
