Cái Nước is a rural district of Cà Mau province in the Mekong Delta region of Vietnam.

[1][2] The district capital lies at Cái Nước.

Like other areas on the Cà Mau peninsula, the terrain is that of a floodplain, and as such, the main industry is marine-based.

The dominant industry in the area is prawn and blue crab farming.

On May 17, 1984, when it was still part of Minh Hải province, Cái Nước comprised the capital Phú Tân and 32 communes: Cái Nước, Hiệp Hưng, Trần Thời, Tân Thới, Tân Hưng, Phong Hưng, Tân Hưng Đông, Hưng Mỹ, Bình Mỹ, Phú Lộc, Phú Hưng, Tân Hiệp, Đông Thới, Thanh Hưng, Thạch Phúc, Thạnh Trung, Lương Thế Tân, Hoà Mỹ, Tân Hải, Phú Hoà, Phú Hiệp, Việt Thắng, Việt Hùng, Tân Hưng Tây, Nguyễn Việt Khái, Phú Thuận, Phú Mỹ A, Phú Thành, Tân Nghiệp, Tân Phong, Việt Dũng and Việt Cường.