Trị An Reservoir, also known as Trị An Lake (Vietnamese: Hồ Trị An), is an artificial lake located on the Dong Nai River, with the territory of Vĩnh Cửu, Định Quán, Thống Nhất and Trảng Bom districts, all in Đồng Nai province.^[1] It stores, then supplies water for Trị An Dam.^[2]

It has an area of 323 square kilometres (80,000 acres) and a capacity of 2.7 billion cubic metres (9.5×10¹⁰ cu ft). In the north of the lake is Cát Tiên National Park. There are 76 small islands in the lake, some of which are inhabited.^[3] Today, it is also a picnic spot in Đồng Nai province.^[4]

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