The two venture partners are Toa and Toyo and Penta and Rinkai, according to the Thai News Service.
The port will be built on the Thi Vai River in Tan Thanh District at a cost of US$718 million, $328.5 million of which will come from Japanese official development assistance through the Japanese Bank for International Co-operation, and the remainder from the Vietnamese Government.
Construction work is scheduled to begin in October and is expected to be completed by 2012.
The contracts cover two main project, the Cai Mep container terminal and the Thi Vai general cargo terminal.
The 48ha Cai Mep terminal will have an overall berth length of 600m. The terminal is designed to receive container vessels of up to 80,000 DWT and a total annual capacity of 600,000-700,000 TEUs. The project will be handled by Toa and Toyo.
The 27ha Thi Vai general cargo terminal, which is being built by the Penta and Rinkai joint venture, will have an overall berth length of 600m and will be able to receive cargo vessels of up to 75,000 DWT. It is designed to have a handling capacity of 1.6 million to two million tonnes of cargo per year.