When visiting Phu Quoc, many travelers only focus on finding blue beaches, luxurious resorts, or lively entertainment complexes. But have you ever wondered: Where does the massive source of fresh water serving millions of visitors and local residents on an isolated island in the middle of the sea come from?
This article, from the perspective of a veteran local tour operator, will help you understand the role of Duong Dong Lake Phu Quoc — the most critical water supply infrastructure project on the Pearl Island, while sharing realistic insights into the natural landscape surrounding the lake for those seeking a quiet, untouched space. We will go over the latest capacity figures, the reality of water security, and the most practical visitor guide.
Practical Context: Why Should Travelers Know About Duong Dong Lake?
As urbanization and tourism development in Phu Quoc skyrocket, pressure on technical infrastructure — especially fresh water resources — has become more intense than ever. Unlike the mainland with its intricate river network, residential water supply in Phu Quoc depends heavily on rainwater, stored surface water, and a portion of groundwater.
Local perspective: Many travelers search for information about “Duong Dong Lake” online and mistakenly assume it is a commercial eco-tourism area offering SUP paddling, commercial camping, or photo-op spots. The reality is quite the opposite. First and foremost, this is a strictly protected water security zone. Understanding the true nature of this infrastructure will help you build a suitable itinerary and avoid disappointment.
Where Is Duong Dong Lake & History of the Project
Duong Dong Lake Phu Quoc is located in the Cửa Dương area, Phu Quoc special administrative region, An Giang province. The lake is surrounded by hills and natural forest canopies, forming a massive rainwater storage basin right in the center of the island.
Location: Cửa Dương Commune, Phu Quoc Special Administrative Region, An Giang Province
Type: Artificial fresh water reservoir
Primary role: Surface water storage, providing raw water for residential supply
Regarding its history, the idea of building a large fresh water reservoir for the Pearl Island was proposed back in 1996. By 2003, the project officially completed its initial phase with a total recorded investment of around $1,712,654.6. This was an important historical milestone, marking a major shift in island infrastructure toward self-sufficiency in residential water supply.
If you want to travel to the Cửa Dương area on your own to take in the surrounding mountain and forest scenery, having your own reliable transport is essential. You can consult the guide on Phu Quoc Motorbike Rental Experience to choose a strong bike that handles the gentle slopes around the basin well.
Scale, Capacity & Water Supply Capability (Latest Updated Figures)
Over more than two decades of operation, the Duong Dong reservoir has been continuously upgraded to keep up with local development.
Capacity Upgrade Phases of the Lake
- Initial phase (2003): Capacity of around 3 million m³, initial raw water supply capability reaching 10,000 – 15,000 m³/day and night.
- Phase 1 Upgrade (2013): Total capacity increased to 4.3 million m³, of which useful storage reached around 3.8 million m³.
- Phase 2 Upgrade (Completed 2022): Total capacity reached over 6.4 million m³, with designed useful storage of over 5.9 million m³.
- Actual record (Late December 2025): Total lake capacity reached approximately 5.94 million m³, with useful storage at around 5.43 million m³.
Note from a tour operator: Lake capacity is not fixed year-round; it fluctuates continuously based on the rainy season, actual rainfall, and extraction volume.
Which Areas Does Duong Dong Lake Supply Water To?
Raw water from the lake is piped to the Dương Đông Water Treatment Plant — currently operating at a capacity of around 24,000 m³/day and night. This system is responsible for supplying water primarily to:
- Dương Đông Ward/Area (the active central hub).
- An Thới area (south island).
- Parts of Cửa Dương and Dương Tơ communes.
Therefore, it should be clearly understood that while Duong Dong Lake plays a core role, it is not the sole or direct supply source for 100% of Phu Quoc Island.
Dry Season Pressure & Duong Dong 2 Lake Project
Water Security Challenges During the Dry Season
During the Phu Quoc dry season (typically lasting from November to April of the following year), rainwater runoff into the lake drops to nearly zero while water demand from tourists and locals hits record highs.
| Parameter / Period | Rainy Season (High Water Level) | Peak Dry Season (e.g., Year 2024) |
| Useful Capacity | ~5.4 – 5.9 million m³ | Once dropped to an alarm level of ~900,000 m³ |
| Water Supply Sustainability | Ensures continuous stability | Only enough to sustain around 40 dry days |
| Operational Status | Standard extraction | Island-wide water conservation appeal |
Starting in early 2026, local authorities continued launching campaigns calling on tourism businesses, hotels, and residents to conserve water in order to ease discharge pressure on Duong Dong Lake.
The Introduction of the Duong Dong 2 Lake Project
To permanently resolve future water security issues, the Duong Dong 2 Lake project has been added to the list of key infrastructure projects.
- Planned scale: Around 2.7 million m³.
- Supply capacity: Extraction of around 15,000 m³/day and night.
- Significance: Directly relieves burden from the existing Duong Dong Lake, ensuring a stable raw water supply for ongoing urban growth.
Duong Dong Lake Landscape: A Distinct Nature Experience on the Pearl Island
If you are used to ocean waves, white sandy beaches, or loud music at beach clubs, the landscape of the Dương Đông fresh water lake offers a completely contrasting moment of quiet.
Enjoying Quiet Space & Mountain Forests
The lake sits tucked in the deep green space of Phu Quoc’s forested hills. The expansive water surface remains calm like a giant mirror reflecting the clouds and sky. Around the lake, there are virtually no high-rise urban developments or heavy traffic, preserving its original tranquil, raw character.
Suitable Experiences Around the Lake Area
- Viewing pristine natural scenery: Standing from elevated vantage points along the road wrapping around the basin, you can take in the vast green canopy and expansive reservoir.
- Nature photography: Trees reflected on the quiet water surface create deep, contemplative photos that stand in stark contrast to bright beach shots.
- Combining central island exploration routes: You can stop by to observe the reservoir area when planning visits to nearby natural streams or forest routes.
For a complete nature experience in this area, you can combine your visit with nearby famous locations like Suối Đá Bàn Phú Quốc or sign up for forest trekking tours to explore Vườn Quốc Gia Phú Quốc. For hiking enthusiasts, trekking routes to the Best Trekking Spots in Phu Quoc are also great options to view the entire Dương Đông basin from a distance.
Guide & Warnings for Travelers Visiting the Lake Area
To ensure a smooth trip and avoid violating local regulations, keep the following in mind:
Important warning from a tour operator:
- DO NOT swim, paddle, or camp near the water’s edge on your own: Duong Dong Lake is the direct source of residential water for tens of thousands of households. Littering, bathing, and unauthorized swimming are strictly prohibited to protect raw water security.
- No commercial tourism services: There are no food or drink stalls, public restrooms, or tent rental facilities here.
- Check the weather before going: Roads leading into the hilly terrain around the lake can get slick in the rainy season. You should consult the Phu Quoc Weather Guide 2026 to pick clear, sunny days.
If you are a road-tripper who loves riding to explore routes along the Cửa Dương forest, hone your riding skills and check out the article Phu Quoc Motorbike Road Trip 3 Days 2 Nights to plan a safe route.
Duong Dong Lake Phu Quoc should be viewed primarily as a vital water supply infrastructure project for the island’s development, and secondarily as a quiet piece of natural scenery amidst the Cửa Dương hills. Travelers respecting fresh water resources when visiting Phu Quoc is the most practical action to protect the long-term sustainability of this island.
To prepare thoroughly for your upcoming trip, you can read more at Phu Quoc Travel Experience from A to Z, check the list of Top 15 Best Attractions in Phu Quoc You Cannot Miss 2025, or view suggested Phu Quoc 3 Days 2 Nights Itinerary to make the most of your trip!
Frequently Asked Questions (FAQ)
1. Where is Duong Dong Lake Phu Quoc located and how do you get there?
You can take route TL47 or Nguyễn Trung Trực street, turn toward the Suối Đá Bàn direction, and follow signs toward the Cửa Dương basin area. The road today is mostly paved and small concrete roads, fairly easy to travel by motorbike or private car.
2. Are visitors allowed to swim or SUP paddle at Duong Dong Lake?
This is the primary raw residential water source for the Dương Đông Water Treatment Plant. Any action polluting the water source will be strictly penalized. Visitors may only view the natural scenery from outer protection corridor roads. If you wish to paddle SUP or swim in fresh water freely, head to permitted natural streams like Suối Tranh or Suối Đá Bàn.
3. What is the current capacity of Duong Dong Lake Phu Quoc in m³?
The maximum designed capacity of the lake following phase 2 upgrades can exceed 6.4 million m³. However, this figure fluctuates continuously depending on actual rainfall and raw water extraction rates sent to the treatment plant.
4. Which areas in Phu Quoc does Duong Dong Lake supply residential water to?
Duong Dong Lake serves as the backbone but is not the sole water source supplying the entire island. Farther areas in the North Island or large resorts often combine internal reservoir systems, permitted industrial wells, or sub-regional water plants.
5. Does Duong Dong Lake run low on water during the Phu Quoc dry season?
Notably, during the 2024 dry season, the lake's useful capacity fell to just about 900,000 m³, barely enough to maintain water supply for roughly 40 dry days. As a result, at the start of each dry season (such as early 2026), local authorities launch island-wide water conservation efforts.
6. What is the Duong Dong 2 Lake project and when is it being implemented?
The project has a planned design capacity of around 2.7 million m³ with an ability to supply roughly 15,000 m³ of raw water/day and night. It has been designated a key infrastructure project starting in 2026 to directly relieve pressure on the existing Duong Dong Lake.
7. What is the best time of day to visit the Duong Dong Lake area?
In the early morning, light mist often hangs over the lake surface and the forest hills of Cửa Dương. Late afternoon brings softer sunlight and cooler air, ideal for pulling over to take landscape photos. Avoid visiting around noon as there is little shade along the main road.
8. Are there any eateries or accommodations near the Duong Dong Lake area?
You should only plan Duong Dong Lake as a brief scenic stop (around 15–30 minutes) on a road trip exploring the Cửa Dương – Suối Đá Bàn – National Park route. For dining or lodging, return to central Dương Đông or main roads like Cửa Lấp – Suối Mây.
