Uirimji: Korea's Oldest Reservoir

Uirimji (의림지) is a man-made reservoir in Jecheon, North Chungcheong Province, covering approximately 150,000 square metres and surrounded by a 1.8-kilometre lakeside walking trail. The reservoir is fed by mountain springs and has maintained a consistent water level for centuries, a fact that earned it status as a Historic and Scenic Site under Korean Cultural Heritage Law. The lake's surface reflects the surrounding hills and the two historic pavilions — Yeonghoru and Gyeonghoeru — built on the eastern bank in the Joseon period.

Historical records attribute the construction of Uirimji to Ugye Bokho, an agricultural engineer of the Three Kingdoms period, making it potentially 1,500 years old — though some historians date earlier earthworks to the prehistoric period. The reservoir was a critical irrigation source for the Jecheon basin throughout the Joseon dynasty and remained in active agricultural use until the twentieth century. It is listed alongside Byeokgolje in Gimje and Susanje in Miryang as one of Korea's three great ancient reservoirs, all of which testify to the sophisticated hydraulic engineering of early Korean civilisations.

The lakeside path is lined with weeping willows and cherry trees that create one of North Chungcheong Province's most celebrated spring blossom walks. The two pavilions are open to visitors and provide elevated views across the reservoir to the forested hills. A small waterfall at the reservoir's overflow weir adds movement and sound to the otherwise tranquil setting. The adjacent Uirimji Theme Park includes a traditional garden and herb plots connected to Jecheon's herbal medicine heritage.

Spring (late March to mid-April) is the peak season for cherry and willow blossoms — weekends are crowded. The reservoir is a 15-minute walk from Jecheon city centre or accessible by local bus. Admission to the lakeside park is free, though the adjacent theme park charges a small entry fee.