Conservation and development of natural capital for sustainable agricultural development in the lower reaches of the Ca River (monograph) ; Song Ca la mot luu vuc lon o vung Bac Trung Bo, co dien tich luu vuc 17.900 km2 phan bo tren lanh tho 2 quoc gia Viet Nam va Lao. O Viet Nam, song Ca nam tren đia gioi hanh chinh cua 3 tinh: Nghe An, Ha Tinh va Thanh Hoa. Nguon tai nguyen thien nhien tren luu vuc song Ca het suc đa dang va phong phu nhu: tai nguyen rung, khoang san, nong nghiep - thuy san... Co the noi, song Ca co vai tro đac biet quan trong cho phat trien nong nghiep, an ninh quoc phong đoi voi cac tinh trong luu luu vuc noi rieng, vung Bac Trung Bo va ca nuoc noi chung ; The Ca River is a large basin in the North Central region, with a catchment area of 17,900 km2 distributed over the territory of 2 countries Vietnam and Laos. In Vietnam, the Ca River is located on the administrative boundaries of 3 provinces: Nghe An, Ha Tinh and Thanh Hoa. Natural resources in the Ca River basin are very diverse and rich such as forest resources, minerals, agriculture - fisheries, etc. It can be said that the Ca River plays a particularly important role for agricultural development, national security and defense for the provinces in the basin in particular, the North Central region and the whole country in general