Nam Ngum Lake

Nam Ngum Lake

The Nam Ngum River, stretching 345 kilometers, is one of the Mekong River’s major tributaries. It originates from the Xiangkhoang Plateau in northern Laos, flows southward through Vientiane Province, and eventually meets the Mekong River northeast of Vientiane. The river rapidly transitions from mountainous to flat terrain, with many meandering sections downstream. The adjacent plains form the largest rice cultivation zone in northern Laos, sustaining a population of over one million.

The Nam Ngum River was among the first in Laos to be developed for cascade hydropower. In the early 1970s, Laos’ first large-scale reservoir was constructed here, featuring a 66-meter-high, 300-meter-long dam. The reservoir spans 120–270 square kilometers with a capacity of 3.8–8.5 billion cubic meters. By 1978, the second phase of the hydroelectric project was completed, generating 110,000 kilowatts of power—producing 700 million kWh annually. Currently, four additional hydropower projects are either under construction or planned along the Nam Ngum River.

Nam Ngum Lake is an artificial reservoir formed by damming the Nam Ngum River. Covering approximately 250 square kilometers, it is said to be the largest artificial lake in South Asia. With over 300 scattered islands, it is also known as the "Thousand Islands Lake." Each island boasts picturesque scenery, allowing visitors to explore the lake’s beauty by boat.

Nam Ngum Lake

Must-visit reason: The largest artificial lake in South Asia

Continent: Asia

Country/Region: Laos

Province/State: Vientiane Capital

City: Vientiane Capital