The lake was historically known as 'Dapizai' and served as a water source for local irrigation.
The unique fan-shaped dam structure near the lake was built to stabilize the hillside and has become a distinct architectural feature.
It is home to a rare species of fish known as the 'Taiwanese shovel-jaw carp', which is often observed in the lake's clear waters.
The lake's water level is maintained by natural mountain springs, keeping it relatively stable throughout the year.
Longtan Lake is the largest natural lake in Yilan County, spanning approximately 17 hectares. The lake sits at the base of the mountains in Jiaoxi Township, featuring a circular perimeter trail stretching about 2.8 kilometers. The surrounding terrain includes the 'Longtan Lake Scenic Area' which features a multi-layered, fan-shaped concrete slope designed to prevent soil erosion. Several Buddhist and Taoist temples, including the Longtan Temple, are situated near the lake's banks. The area serves as a habitat for diverse migratory birds and local wildlife due to the surrounding lush vegetation. The site is a popular destination for cycling and walking because of its flat, paved perimeter path.
The elevated fan-shaped concrete slope, which offers a wide-angle view of the entire lake and surrounding mountain range.
Walk the full loop to see the different vegetation zones and the varied viewpoints of the mountains.
Bring a hat and sunscreen as large portions of the walking trail are exposed to direct sunlight.
Visit the small observatory or viewing platforms along the trail to spot local bird species.
Attempting to swim or fish in the lake, as both are strictly prohibited to protect the local ecosystem.
Respect local temples by maintaining a quiet demeanor and ensuring shoulders and knees are covered when entering prayer areas.
