Khoun Kong Leng Lake is one of Laos’s most outstanding natural destinations, drawing visitors with its clear turquoise water, majestic limestone scenery, and peaceful setting amid the mountains and forests of Khammouane. It’s an ideal spot for anyone wanting to reconnect with untouched nature and unwind amid a tranquil landscape.

1. About Khoun Kong Leng Lake, Laos

Locally known as Evening Gong Lake, Khoun Kong Leng is a stunning limestone lake located within the Phu Hin Bun National Protected Area in Khammouane Province, Laos. The lake formed from a natural sinkhole fed by underground water flowing through limestone layers, giving it remarkably clear water with a distinctive turquoise-green hue.

While the lake’s actual depth has not been precisely measured, the site remains famous for its untouched beauty and peaceful scenery amid the towering limestone mountains. The name Khoun Kong Leng is also tied to a local legend about the sound of a gong ringing out in the evening, adding an air of mystery that appeals to nature-loving explorers.

Khoun Kong Leng Lake (Photo: Collected)

The lake’s water stays cool year-round thanks to its natural underground springs, offering a refreshing escape from Laos’s hot weather. To protect the ecosystem, visitors are not allowed to swim directly in the lake itself and may only enjoy the water in the stream that flows out from it, under local guidance.

Around the lake, visitors can also enjoy relaxing activities such as forest walks, rope swinging, or resting at small huts that sell food and drinks. The area has retained its pristine character and hasn’t been heavily commercialized for tourism, making it a favorite among nature lovers and those seeking a quiet space—especially on weekends, when locals often come to picnic and grill food by the stream.

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2. The legend of Khoun Kong Leng Lake

According to local belief, Khoun Kong Leng Lake is celebrated not only for its natural beauty but also for the many mystical stories passed down through generations. Many people believe the lake holds a special energy, and that on full-moon nights, a bell-like sound can sometimes be heard echoing across the still water.

These legends have given the lake its own spiritual character and made it an important part of the local culture in the Khammouane region.

As tourism in Laos continues to grow, Khoun Kong Leng Lake has gradually become more widely known among travelers. Even so, local authorities remain focused on preserving its natural beauty and protecting the ecosystem within the Phu Hin Bun National Protected Area.

The caves surrounding Khoun Kong Leng Lake (Photo: Collected)

Recent ecotourism development projects have mainly aimed at making the site accessible to visitors while limiting the impact on the surrounding environment. As a result, Khoun Kong Leng Lake has kept its distinctive untouched character and is regarded as a “hidden gem” amid Laos’s limestone mountains.

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3. Getting to Khoun Kong Leng Lake

Khoun Kong Leng Lake lies about 50 kilometers northeast of Thakhek city in Khammouane Province, Laos, and is mainly reached by road. From central Thakhek, travelers head north along National Route 13, then turn onto a smaller road leading to the Ban Na Kheu area.

This route passes through hills, villages, and quite scenic countryside, capturing the peaceful character typical of rural Laos. In recent years, many stretches of the road have been paved, making travel more convenient than before, though some sections can still be slippery and rough during the rainy season.

For those who prefer independent exploration, many travelers rent a motorbike in Thakhek for around 90,000 Lao kip per day. This is also a familiar part of the well-known Thakhek Loop route. However, since the journey includes several winding, hilly stretches, this option suits experienced long-distance riders better.

Thakhek City (Photo: Collected)

Besides motorbikes, visitors can also hire tuk-tuks, minivans, or join local tours for a more comfortable and safer way to get around.

For travelers starting from Vientiane, the trip to Thakhek usually takes around 6–9 hours by bus, or less by private car. After reaching Thakhek, it takes about another hour to get to Khoun Kong Leng Lake. Many visitors combine this trip with a visit to Kong Lor Cave and other well-known natural attractions in Khammouane.

Local buses on National Route 13 can also stop near the turnoff to the lake, though the service isn’t very convenient, so most travelers still prefer renting private transport or joining a tour for a more flexible itinerary.

4. When is the best time to visit the lake?

Based on travel experience at Khoun Kong Leng Lake in Laos, the best time to visit is during the dry season, from around November to March. The weather is cooler then, the roads are dry, and getting to the lake is much easier.

The clear water and surrounding limestone scenery look especially beautiful on mild, sunny days, making it a great time for sightseeing, photography, and relaxing in nature. This is also the period most travelers choose for exploring the Khammouane region of Laos.

During the rainy season, from May to October, the road to the lake can become slippery and harder to navigate due to its many winding, hilly stretches. Heavy rain at certain times can also bring a risk of flooding or minor flash floods, so visitors need to drive carefully, especially those traveling by motorbike.

During this season, many people choose to travel with a local guide for extra safety. Visitors are also encouraged to help protect the environment and avoid littering, to help preserve the untouched natural beauty of Khoun Kong Leng Lake.

The best time to visit this place is usually during the dry season. (Photo: Collected)

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5. Entrance fees and facilities

Visitors to Khoun Kong Leng Lake need to buy an entrance ticket at a fairly low price, around 5,000 Lao kip per person. Before taking part in any water activities, visitors usually need to ask permission from the residents of Ban Na Kheu village to ensure compliance with local environmental protection rules.

To help preserve the lake’s natural ecosystem, visitors are not permitted to swim directly in the main lake and may only enjoy the water in the stream flowing out near the wooden bridge outside. Fishing is also completely prohibited to help preserve the site’s untouched beauty.

The lake is open daily and is mainly suited to day trips, since the surrounding area has no accommodation—visitors typically stay at guesthouses in Thakhek before or after their trip. As of 2024, the lake reopened after a period of renovation and continues to draw nature lovers.

Although tourism here is not yet highly developed, the lake area does offer some basic amenities for visitors. Shaded spots around the lake are well suited for resting or laying out a mat for a picnic amid nature. A few small stalls run by local residents also sell snacks, drinks, and simple dishes for visitors.

That said, the site remains fairly rustic, so services are limited—there are no clearly designated restrooms, in particular. For this reason, many visitors bring their own drinking water, tissues, and other essentials before visiting Khoun Kong Leng Lake.

6. Activities for visitors

6.1. Swimming

You are only allowed to swim in certain permitted areas. (Photo: Collected)

Visitors to Khoun Kong Leng Lake can take part in water activities in designated permitted areas, though they should first ask local authorities or residents for permission to ensure compliance with environmental protection rules.

Once approved, visitors may only swim in the section of stream flowing out from the lake, rather than in the main lake itself, in order to preserve the natural ecosystem and respect the cultural beliefs of the local community. Thanks to underground water filtering through limestone, the water here stays clear and refreshingly cool amid the quiet mountain-forest surroundings.

Beyond relaxing by the emerald-blue water, the lake area also offers a few light outdoor activities for adventure-loving visitors, including a popular rope swing across the stream. The fresh air and untouched natural scenery make this an ideal stop for anyone wanting to briefly escape the noise of city life. Though not heavily crowded or tourism-developed, Khoun Kong Leng Lake still offers a distinctive sense of peace that many visitors remember long after their trip.

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6.2. Walking

Around Khoun Kong Leng Lake, several small trails lead deep into the Phou Hin Poun forest, giving visitors a chance to explore nature in a more intimate, unhurried way. These paths wind between the limestone mountains and lush greenery, amid the quiet atmosphere typical of Laos’s karst landscape. Along the way, visitors can catch many beautiful views of the emerald-blue lake set against the wild, untouched mountain scenery.

The trekking routes here aren’t too difficult, so they suit even those who just want a light walk to enjoy nature. The cool air, birdsong, and lush green surroundings make walking around the lake a deeply relaxing experience. This is also a favorite activity for visitors wanting to fully immerse themselves in nature and take in the untouched beauty of the Phou Hin Poun protected area.

6.3. Picnicking

Picnicking by Khoun Kong Leng Lake is one of the most popular activities among visitors. Many people bring snacks and drinks, laying out a mat to rest beneath the shady trees along the lake to soak in the peaceful atmosphere of nature. The vivid blue water set against the limestone mountains creates a deeply relaxing scene, perfect for a casual picnic with friends or family.

Beyond simply relaxing, the area around the lake is also a great spot for photography and sightseeing. The site’s untouched natural beauty remains largely intact, with forest, mountains, and crystal-clear water reflecting the sky above. This tranquil, unspoiled quality gives Khoun Kong Leng Lake a distinctly peaceful atmosphere, ideal for anyone wanting to step away from the hustle and bustle and unwind amid Laos’s natural landscape.

With its untouched beauty and fresh air, Khoun Kong Leng Lake offers a gentle, distinctive experience for any trip through Laos. For nature lovers seeking a quiet place to rest, it’s certainly a destination well worth visiting.