The lake was formed in 1984 during the construction of the Trị An Hydroelectric Plant, supported by Soviet engineering aid.
Its surface area expands and contracts by several square kilometers depending on the monsoon season's water intake.
The reservoir acts as a primary flood control mechanism for the lower Dong Nai river basin.
O Island serves as a designated eco-tourism zone maintained with minimal infrastructure to preserve local biodiversity.
Trị An Lake is a 323-square-kilometer reservoir created by the damming of the Dong Nai River for the Trị An Hydroelectric Power Plant. It holds approximately 2.7 billion cubic meters of water at its maximum capacity. The lake features over 70 small islands, most notably O Island and Dong Truong Island, which are accessible by local boat services. The surrounding area remains largely undeveloped, providing habitats for various bird species and freshwater fish populations. It serves as a critical water source for regional agriculture and industrial cooling in Dong Nai province. Local tourism focuses on lakeside camping, fishing, and boating activities. The reservoir's water level fluctuates significantly depending on seasonal rainfall patterns and power generation requirements.
The shoreline views from O Island looking toward the sunset over the dam reservoir.
Bring portable power banks and ample drinking water as island facilities are basic.
Check local weather reports for the rainy season, as water levels can shift rapidly affecting boat access.
Use insect repellent, as the lake's proximity to forest areas results in high mosquito activity at dusk.
Attempting to swim in designated power plant cooling zones or near dam structures due to strong, unpredictable currents.
Respect local fishing zones and carry out all trash to maintain the undeveloped shoreline environment.
