Gieng Islet Cathedral, also known as Dau Nuoc Family Cathedral, is a church belonging to Long Xuyen Diocese, located in Tan Binh hamlet, Tan My commune, Cho Moi district. According to old documents, this was the first cathedral in the South, built 13 years before Notre Dame Cathedral in Saigon. Cu Lao Gieng Church is an ancient architectural work built by priest Gafignol (often called Father Nho) in the year At Hoi 1875, during the reign of Tu Duc. Building a large church on an island almost isolated from the outside world at that time was extremely difficult. Most of the raw materials had to be brought from France. In the year of the Pig, 1887, during Dong Khanh's reign, the project was completed.