海陽省
In 1890, the French set up the Bãi Sậy area consisting of Yên Mỹ, Yen Hao, Văn Lâm and Cam Luong districts for the purpose of easier suppression of revolts. After the failure of the Bãi Sậy rebellion, they merged Van Lam, Yên Mỹ and Yen Hao districts into Hưng Yên Province and returned Cam Luong district (now Cẩm Giàng) to Hải Dương Province.