Nong Fa Lake, also known as Nongphatom Lake or the “Blue Lake,” is one of the most mysterious and breathtaking natural attractions in Laos. Hidden deep within the mountains of Sanxay District in Attapeu Province, this volcanic crater lake lies within the protected Dong Ampham National Biodiversity Conservation Area, one of the country's most pristine wilderness regions. Situated approximately 1,154 meters above sea level and close to the Vietnamese border, the lake is renowned for its striking blue waters, remote location, and fascinating local legends.

Formed thousands of years ago by volcanic activity, Nong Fa Lake is believed to occupy an ancient volcanic crater. The lake reaches a reported depth of around 78 meters, although local villagers insist its true depth remains unknown. According to local stories, attempts to measure the lake using long bamboo poles were unsuccessful, contributing to the lake's reputation as a place of mystery.

One of the lake's most remarkable features is its vibrant blue color, which remains visible throughout the year. Surrounded by dense forests, mountain ridges, and untouched wilderness, the lake creates a spectacular contrast against the lush green landscape. The area is home to diverse wildlife and forms part of one of Southeast Asia's most important biodiversity conservation zones.

Nong Fa Lake is also deeply connected to local folklore. Many Lao people believe the lake is inhabited by a mythical snake-pig creature that protects its waters and punishes those who disturb it. As a result, many locals avoid swimming in the lake. In contrast, some hill tribe communities believe that bathing in the lake grants eternal youth and good fortune. These legends have helped preserve the lake's sacred status for generations.

The lake also played a role during the Vietnam War. Due to its remote location, it served as a rest point for North Vietnamese soldiers traveling along sections of the Ho Chi Minh Trail. American pilots reportedly used the perfectly round lake as a navigation landmark, nicknaming it "Dollar Lake" because of its circular shape.

Today, Nong Fa Lake remains one of Laos' most remote and least-visited natural wonders. Reaching the lake often involves long drives through rugged terrain, trekking through forests, or joining specialized eco-tourism expeditions. The journey itself is part of the adventure, taking visitors through remote ethnic villages, mountain valleys, and untouched rainforest landscapes.

For travelers seeking authentic wilderness experiences, spectacular scenery, and one of Laos' most enigmatic destinations, Nong Fa Lake offers an unforgettable adventure far from the typical tourist trail.

Opening Hours

  • Open daily: 06:00 AM – 06:00 PM
  • Accessible year-round, weather permitting.
  • Best time to visit:
    • November to April during the dry season for easier access and trekking conditions.
    • Early morning for misty lake views and photography.
    • December to February for cooler temperatures and clear skies.

Highlights

  • Rare volcanic crater lake in southeastern Laos.
  • Stunning year-round blue waters.
  • Located within Dong Ampham National Biodiversity Conservation Area.
  • Surrounded by pristine rainforest and mountains.
  • Rich local legends and folklore.
  • Historic connection to the Ho Chi Minh Trail.
  • Excellent trekking and eco-tourism destination.
  • One of the most remote natural attractions in Laos.
  • Exceptional wildlife and birdwatching opportunities.
  • Incredible landscape and nature photography.

Visitor Tips

  • Visit during the dry season for easier access.
  • Hire a local guide, as routes can be remote and difficult to navigate.
  • Bring sufficient water, snacks, and basic supplies.
  • Wear sturdy hiking shoes and outdoor clothing.
  • Carry insect repellent and rain protection.
  • Respect local beliefs and avoid disturbing the lake environment.
  • Be prepared for limited facilities in remote areas.
  • Consider an overnight trekking tour for the best experience.
  • Bring a camera with extra batteries, as the scenery is spectacular.
  • Allow at least a full day or multi-day excursion depending on your route.

Location

Nong Fa Lake is located in Sanxay District, Attapeu Province, approximately 12 kilometers from the Vietnamese border within the Dong Ampham National Biodiversity Conservation Area. Due to its remote location, access is typically arranged through local guides or trekking tours from Attapeu Town.