According to documentation of Bac Lieu Bird Sanctuary Nature Reserve, in the first, it was a coastal rich and diversified salt forest floor with the natural salt-marsh ecosystem. As a part of the remaining forest floor along the East Sea, it is increasingly far from the sea due to alluvial deposits. In 1962, it was looked after, protected and controlled by a household. Then, the local authority realized that it is a precious natural property, so they have a step by step investment.

With the natural salt-marsh forest ecosystem on the area of approximately 385ha, of which 19ha is primitive forest, the garden is the home of around 46 kinds of birds, some of which are in the Red Book such as Giang Sen, small King Cormorant; 109 kinds of plants belong to 90 lines of 46 descents; 150 kinds of animals, of which there are 58 kinds of fish, 7 kinds of amphibians, 10 mammals, 8 reptiles and some other kinds of animals living together in the same diversified community which needs preservation and development.

The Sanctuary is the important home of several water birds, mainly teal, stork, heron, night heron and cormorant. Each flock of birds flies for food in the early morning and returns their nests in the Sanctuary in the evening while the night birds start their journeys, which agitate the atmosphere of the Sanctuary.

Over nearly one century, the Sanctuary is the place where generations of birds are born, usually in the rainy season, and developed. There are currently some 40,000 birds and 5,000 nests, according to preliminary statistics. Birds mostly gather here during the rainy season between May and October.