Business on O Island, Dong Truong Island , domestic wastewater is preliminarily treated through septic tanks, then led to a collection pit (additional bathing water, kitchen wastewater) and discharged directly into the stormwater drainage system, flowing into Tri An Lake.

Wastewater after treatment is discharged into Tri An Lake, using land and water surface of the core area of ​​the Biosphere Reserve, which is an environmentally sensitive factor according to regulations.

Dong Nai Provincial People's Committee decided to penalize 3 acts, including: not having an impact assessment report and environmental license, not having measures to collect and treat waste that meet requirements.

Cuong Thuan IDICO Company was fined more than 1.5 billion VND and all activities of the Dao O-Dong Truong Tourism Center were suspended for 4.5 months.

The Department of Agriculture and Environment of Dong Nai province has chaired the announcement of the decision of the People's Committee of Dong Nai province to reclaim land and hand it over to the Provincial Land Fund Development Center for management and to develop an auction plan for O island, Dong Truong island and the restaurant land with a total reclaimed area of ​​more than 233,800m2.

However, it is still unclear why the decision to reclaim land was signed and issued by the leaders of Dong Nai Province People's Committee more than 6 years ago, but has been delayed until now before being put into practice.

Previously, this land was managed by Dong Nai Tourism Joint Stock Company. On January 17, 2017, Dong Nai Tourism Joint Stock Company transferred all assets on the leased land area to Cuong Thuan IDICO Investment and Development Joint Stock Company according to Asset Transfer Contract No. 02/HDCNTSTD-2017.

The swimming pool on O Island of the tourist area has not fully implemented the procedures for swimming activities according to regulations.

The O-Dong Truong Island tourist area has not yet completed investment procedures and construction, land and environmental procedures. Therefore, Dong Nai provincial authorities have requested to stop tourism business activities.

Since March 1, Cuong Thuan IDICO Company has temporarily closed the O-Dong Truong Island Tourist Area to serve the inspection and verification of related issues.

Bridge between O Island and Dong Truong Island.

The hotel project was invested and built by Cuong Thuan IDICO Company on O Island.

Container rooms are invested on Dong Truong island.

Dong Nai province authorities are continuing to clarify land management and construction at the Dao O-Dong Truong tourist area.